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股本结构

单位：万股
公告日期 2024-04-29 2024-04-29 2024-04-15 2024-02-20 2024-02-20 2023-10-27
证券总股本 13138.84 13132.93 13151.70 13135.23 13117.75 13158.77
普通股本 13138.84 13132.93 13151.70 13135.23 13117.75 13158.77
优先股 未披露 未披露 未披露 未披露 未披露 未披露
其他 未披露 未披露 未披露 未披露 未披露 未披露
变动日期 2024-04-11 2024-03-31 2024-03-22 2024-01-31 2023-12-31 2023-10-12
注释：中概股证券总股本=普通股股本/ 存托凭证比例

历史变动

公告日期 变动后普通股本（万股） 变动后优先股（万股） 变动原因 变动日期
2024-04-29 13138.84 未披露 定期报告 2024-04-11
2024-04-29 13132.93 未披露
更多>>
From January 1, 2024 to March 31, 2024 Issuance of common stock under employee stock purchase plan Purchase and retirement of common stock Issuance of common stock under share-based award plans
2024-03-31
2024-04-15 13151.70 未披露 定期报告 2024-03-22
2024-02-20 13135.23 未披露 定期报告 2024-01-31
2024-02-20 13117.75 未披露
更多>>
From December 31, 2022 to December 31, 2023 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock under share-based award plans
2023-12-31
2023-10-27 13158.77 未披露 定期报告 2023-10-12
2023-10-27 13157.10 未披露
更多>>
From July 1, 2023 to September 30, 2023 Issuance of common stock under employee stock purchase plan Purchase and retirement of common stock Issuance of common stock under share-based award plans
2023-09-30
2023-07-28 13235.81 未披露 定期报告 2023-07-13
2023-07-28 13223.00 未披露
更多>>
From April 1, 2023 to June 30, 2023 Issuance of common stock under share-based award plans Issuance of common stock under employee stock purchase plan Purchase and retirement of common stock
2023-06-30
2023-04-24 13330.61 未披露 定期报告 2023-04-18
2023-04-24 13326.80 未披露
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From January 1, 2023 to March 31, 2023 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock under share-based award plans
2023-03-31
2023-04-20 13336.83 未披露 定期报告 2023-03-24
2023-02-21 13426.40 未披露 定期报告 2023-01-31
2023-02-21 13416.20 未披露
更多>>
20211231-20221231 普通股的购买和报废 根据员工股票购买计划发行普通股 行使股票期权后发行普通股
2022-12-31
2022-10-28 13482.85 未披露 定期报告 2022-10-20
2022-10-26 13481.60 未披露 定期报告 2022-09-30
2022-07-25 13548.90 未披露 定期报告 2022-07-15
2022-07-25 13548.00 未披露
更多>>
From April 1, 2022 to June 30, 2022 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
2022-06-30
2022-04-25 13726.56 未披露 定期报告 2022-04-21
2022-04-25 13721.90 未披露
更多>>
From January 1, 2022 to March 31, 2022 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
2022-03-31
2022-02-22 13835.41 未披露 定期报告 2022-01-31
2022-02-22 13844.90 未披露
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From December 31, 2020 to December 31, 2021 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2021-12-31
2021-10-25 13945.25 未披露 定期报告 2021-10-21
2021-10-25 13930.50 未披露
更多>>
From July 1, 2021 to September 30, 2021 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
2021-09-30
2021-07-26 14107.66 未披露 定期报告 2021-07-22
2021-07-26 14102.70 未披露
更多>>
From April 1, 2021 to June 30, 2021 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
2021-06-30
2021-04-26 14280.98 未披露 定期报告 2021-04-23
2021-04-26 14270.10 未披露
更多>>
from January 1, 2021 to March 31, 2021 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
2021-03-31
2021-04-27 14266.96 未披露 定期报告 2021-03-26
2021-02-22 14351.67 未披露 定期报告 2021-01-29
2021-02-22 14339.60 未披露
更多>>
From December 31,2019 to December 31,2020 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2020-12-31
2020-10-26 14456.99 未披露 定期报告 2020-10-21
2020-10-26 14449.10 未披露
更多>>
From July 1,2020 to September 30,2020 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
2020-09-30
2020-07-28 14650.16 未披露 定期报告 2020-07-23
2020-07-28 14644.50 未披露
更多>>
From April 1, 2020 to June 30, 2020 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
2020-06-30
2020-04-28 14793.20 未披露 定期报告 2020-04-17
2020-04-28 14790.30 未披露
更多>>
From January 1, 2020 to March 31, 2020 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
2020-03-31
2020-04-23 14796.66 未披露 定期报告 2020-03-27
2020-02-24 14997.55 未披露 定期报告 2020-01-31
2020-02-24 14974.50 未披露
更多>>
from December 31, 2018 to December 31, 2019 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
2019-12-31
2019-10-24 15025.62 未披露 定期报告 2019-10-17
2019-10-24 15022.20 未披露
更多>>
From July 1, 2019 To September 30, 2019 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
2019-09-30
2019-07-25 15102.38 未披露 定期报告 2019-07-18
2019-07-25 15095.50 未披露
更多>>
From April 1, 2019 To June 30, 2019 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
2019-06-30
2019-04-25 15252.02 未披露 定期报告 2019-04-18
2019-04-25 15227.60 未披露
更多>>
from January 1, 2019 to March 31, 2019 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
2019-03-31
2019-04-17 15240.13 未披露 定期报告 2019-03-22
2019-02-25 15369.01 未披露 定期报告 2019-01-31
2019-02-25 15363.40 未披露
更多>>
from December 31, 2017 to December 31, 2018 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2018-12-31
2018-10-25 15554.03 未披露 定期报告 2018-10-18
2018-10-25 15547.50 未披露 定期报告 2018-09-30
2018-07-24 15682.60 未披露 定期报告 2018-07-16
2018-07-24 15680.00 未披露 定期报告 2018-06-30
2018-04-26 15808.43 未披露 定期报告 2018-04-19
2018-04-26 15799.00 未披露 定期报告 2018-03-31
2018-04-10 15798.87 未披露 定期报告 2018-03-23
2018-04-10 15804.30 未披露 定期报告 2018-03-15
2018-02-22 15727.83 未披露 定期报告 2018-01-31
2018-02-22 15706.90 未披露
更多>>
from December 31, 2016 to December 31, 2017 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2017-12-31
2017-10-26 15747.31 未披露 定期报告 2017-10-19
2017-10-26 15740.50 未披露 定期报告 2017-09-30
2017-07-27 15810.76 未披露 定期报告 2017-07-20
2017-07-27 15798.60 未披露 定期报告 2017-06-30
2017-04-20 15870.98 未披露 定期报告 2017-04-13
2017-04-20 15868.70 未披露 定期报告 2017-03-31
2017-04-05 15913.21 未披露 定期报告 2017-03-24
2017-02-22 15917.61 未披露 定期报告 2017-01-31
2017-02-22 15903.10 未披露
更多>>
from December 31, 2015 to December 31, 2016 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2016-12-31
2016-10-21 15999.89 未披露 定期报告 2016-10-13
2016-10-21 15995.40 未披露 定期报告 2016-09-30
2016-07-27 16132.62 未披露 定期报告 2016-07-21
2016-07-27 16119.10 未披露 定期报告 2016-06-30
2016-04-20 16199.31 未披露 定期报告 2016-04-19
2016-04-20 16190.80 未披露 定期报告 2016-03-31
2016-04-05 16211.67 未披露 定期报告 2016-03-23
2016-02-22 16364.97 未披露 定期报告 2016-01-29
2016-02-22 16373.30 未披露
更多>>
from December 31, 2014 to December 31, 2015 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2015-12-31
2015-10-21 16463.89 未披露 定期报告 2015-10-16
2015-10-21 16459.80 未披露 定期报告 2015-09-30
2015-07-22 16588.85 未披露 定期报告 2015-07-17
2015-07-22 16586.00 未披露 定期报告 2015-06-30
2015-04-22 16614.10 未披露 定期报告 2015-04-17
2015-04-22 16607.10 未披露 定期报告 2015-03-31
2015-04-09 16635.52 未披露 定期报告 2015-03-23
2015-02-23 16683.20 未披露 定期报告 2015-01-30
2015-02-23 16668.80 未披露
更多>>
From December 31,2013 to December 31,2014 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2014-12-31
2014-10-23 16723.59 未披露 定期报告 2014-10-21
2014-10-23 16711.20 未披露 定期报告 2014-09-30
2014-07-23 16776.54 未披露 定期报告 2014-07-22
2014-07-23 16768.30 未披露 定期报告 2014-06-30
2014-04-23 16915.94 未披露 定期报告 2014-04-22
2014-04-23 16907.10 未披露 定期报告 2014-03-31
2014-04-11 16901.11 未披露 定期报告 2014-03-21
2014-02-27 16948.94 未披露 定期报告 2014-01-31
2014-02-27 16924.20 未披露
更多>>
From December 31,2012 to December 31,2013 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2013-12-31
2013-10-24 17060.81 未披露 定期报告 2013-10-22
2013-10-24 17050.00 未披露 定期报告 2013-09-30
2013-07-26 17177.08 未披露 定期报告 2013-07-24
2013-07-26 17151.60 未披露 定期报告 2013-06-30
2013-04-26 17240.36 未披露 定期报告 2013-04-24
2013-04-26 17234.20 未披露 定期报告 2013-03-31
2013-04-23 17241.06 未披露 定期报告 2013-03-22
2013-02-22 17264.24 未披露 定期报告 2013-01-31
2013-02-22 17222.00 未披露
更多>>
from December 31, 2011 to December 31,2012 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2012-12-31
2012-10-26 17289.86 未披露 定期报告 2012-10-24
2012-10-26 17286.80 未披露 定期报告 2012-09-30
2012-08-02 17355.66 未披露 定期报告 2012-07-31
2012-08-02 17337.40 未披露 定期报告 2012-06-30
2012-05-03 17553.32 未披露 定期报告 2012-04-30
2012-05-03 17546.90 未披露 定期报告 2012-03-31
2012-02-27 17659.19 未披露 定期报告 2012-01-31
2012-02-27 17650.60 未披露
更多>>
from January 1, 2011 to December 31, 2011 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2011-12-31
2011-11-03 17878.42 未披露 定期报告 2011-10-31
2011-11-03 17961.10 未披露 定期报告 2011-09-30
2011-08-04 18257.94 未披露 定期报告 2011-07-31
2011-08-04 18317.50 未披露 定期报告 2011-06-30
2011-05-05 18521.02 未披露 定期报告 2011-04-30
2011-05-05 18505.90 未披露 定期报告 2011-03-31
2011-02-24 18611.46 未披露 定期报告 2011-01-31
2011-02-24 18614.10 未披露
更多>>
from December 31,2009 to December 31,2010 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2010-12-31
2010-11-04 18702.37 未披露 定期报告 2010-10-28
2010-11-04 18680.30 未披露 定期报告 2010-09-30
2010-08-05 18848.88 未披露 定期报告 2010-07-28
2010-08-05 18866.60 未披露 定期报告 2010-06-30
2010-02-25 18982.42 未披露 定期报告 2010-02-19
2010-02-25 19020.80 未披露
更多>>
from December 31,2008 to December 31,2009 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2009-12-31
2009-02-25 19120.86 未披露 定期报告 2009-02-20
2009-02-25 19119.50 未披露
更多>>
from December 31, 2007 to December 31, 2008 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2008-12-31
2008-02-26 19443.14 未披露 定期报告 2008-01-31
2008-02-26 19437.50 未披露
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from December 31, 2006 to December 31, 2007 Stock dividend Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options On May 23, 2007, the Board of Directors approved a two-for-one stock split of the Company’s $.01 par value common stock, effected in the form of a stock dividend which was paid on June 21, 2007 to shareholders of record on June 11, 2007.
2007-12-31
2007-02-23 9904.78 未披露 定期报告 2007-01-31
2007-02-23 9895.30 未披露
更多>>
from December 31, 2005 to December 31, 2006 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2006-12-31
2006-03-16 9895.13 未披露 定期报告 2006-02-15
2006-03-16 9858.00 未披露
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from December 31, 2004 to December 31, 2005 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2005-12-31
2005-03-14 10184.03 未披露 定期报告 2005-02-15
2005-03-14 10217.50 未披露
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from December 31, 2003 to December 31, 2004 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2004-12-31
2004-03-15 10495.18 未披露 定期报告 2004-02-27
2004-03-15 10486.90 未披露
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from December 31, 2002 to December 31, 2003 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2003-12-31
2003-03-28 10555.41 未披露 定期报告 2003-02-28
2003-03-28 10618.40 未披露
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from December 31, 2001 to December 31, 2002 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2002-12-31
2002-03-28 10944.03 未披露 定期报告 2002-02-28
2002-03-28 10918.00 未披露
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from December 31, 2000 to December 31, 2001 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2001-12-31
2001-03-29 10861.85 未披露 定期报告 2001-02-28
2001-03-29 10856.00 未披露
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from December 31, 1999 to December 31, 2000 Stock split adjustment Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
2000-12-31
2000-03-29 1763.78 未披露 定期报告 2000-02-29
2000-03-29 1769.20 未披露
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from December 31, 1998 to December 31, 1999 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
1999-12-31
1999-03-29 1787.41 未披露 定期报告 1999-02-26
1999-03-29 1786.10 未披露
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from DECEMBER 31, 1997 to DECEMBER 31, 1998 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
1998-12-31
1998-03-27 1772.99 未披露 定期报告 1998-02-28
1998-03-27 1776.70 未披露
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from DECEMBER 31, 1996 to DECEMBER 31, 1997 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
1997-12-31
1997-03-31 1856.09 未披露 定期报告 1997-02-28
1997-03-31 1849.80 未披露
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from December 31, 1995 to December 31, 1996 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
1996-12-31
1996-03-29 1855.34 未披露 定期报告 1996-02-29
1996-03-29 1842.50 未披露
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from DECEMBER 31, 1994 to DECEMBER 31, 1995 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
1995-12-31
1996-03-29 1878.10 未披露
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from DECEMBER 31, 1993 to DECEMBER 31, 1994 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
1994-12-31
From January 1, 2024 to March 31, 2024 Issuance of common stock under employee stock purchase plan Purchase and retirement of common stock Issuance of common stock under share-based award plans
From December 31, 2022 to December 31, 2023 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock under share-based award plans
From July 1, 2023 to September 30, 2023 Issuance of common stock under employee stock purchase plan Purchase and retirement of common stock Issuance of common stock under share-based award plans
From April 1, 2023 to June 30, 2023 Issuance of common stock under share-based award plans Issuance of common stock under employee stock purchase plan Purchase and retirement of common stock
From January 1, 2023 to March 31, 2023 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock under share-based award plans
20211231-20221231 普通股的购买和报废 根据员工股票购买计划发行普通股 行使股票期权后发行普通股
From April 1, 2022 to June 30, 2022 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
From January 1, 2022 to March 31, 2022 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
From December 31, 2020 to December 31, 2021 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
From July 1, 2021 to September 30, 2021 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
From April 1, 2021 to June 30, 2021 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
from January 1, 2021 to March 31, 2021 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
From December 31,2019 to December 31,2020 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
From July 1,2020 to September 30,2020 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
From April 1, 2020 to June 30, 2020 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
From January 1, 2020 to March 31, 2020 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2018 to December 31, 2019 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
From July 1, 2019 To September 30, 2019 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
From April 1, 2019 To June 30, 2019 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
from January 1, 2019 to March 31, 2019 Purchase and retirement of common stock Issuance of common stock under employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2017 to December 31, 2018 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2016 to December 31, 2017 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2015 to December 31, 2016 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2014 to December 31, 2015 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
From December 31,2013 to December 31,2014 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
From December 31,2012 to December 31,2013 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2011 to December 31,2012 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from January 1, 2011 to December 31, 2011 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31,2009 to December 31,2010 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31,2008 to December 31,2009 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2007 to December 31, 2008 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2006 to December 31, 2007 Stock dividend Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options On May 23, 2007, the Board of Directors approved a two-for-one stock split of the Company’s $.01 par value common stock, effected in the form of a stock dividend which was paid on June 21, 2007 to shareholders of record on June 11, 2007.
from December 31, 2005 to December 31, 2006 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2004 to December 31, 2005 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2003 to December 31, 2004 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2002 to December 31, 2003 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2001 to December 31, 2002 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 2000 to December 31, 2001 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 1999 to December 31, 2000 Stock split adjustment Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 1998 to December 31, 1999 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from DECEMBER 31, 1997 to DECEMBER 31, 1998 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from DECEMBER 31, 1996 to DECEMBER 31, 1997 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from December 31, 1995 to December 31, 1996 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from DECEMBER 31, 1994 to DECEMBER 31, 1995 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options
from DECEMBER 31, 1993 to DECEMBER 31, 1994 Purchase and retirement of common stock Issuance of common stock under the employee stock purchase plan Issuance of common stock upon exercise of stock options