Quarter	US dollars
1999-03-31	36553
1999-06-30	38119
1999-09-30	39880
1999-12-31	45154
2000-03-31	41575
2000-06-30	43906
2000-09-30	43045
2000-12-31	53344
2001-03-31	56641
2001-06-30	50771
2001-09-30	49589
2001-12-31	52146
2002-03-31	50413
2002-06-30	46609
2002-09-30	40467
2002-12-31	46536
2003-03-31	37569
2003-06-30	37523
2003-09-30	37086
2003-12-31	49290
2004-03-31	44376
2004-06-30	38040
2004-09-30	46290
2004-12-31	51811
2005-03-31	45229
2005-06-30	42119
2005-09-30	37414
2005-12-31	52077
2006-03-31	56723
2006-06-30	54672
2006-09-30	58513
2006-12-31	68112
2007-03-31	72355
2007-06-30	90993
2007-09-30	126770
2007-12-31	140272
2008-03-31	130594
2008-06-30	97009
2008-09-30	115500
2008-12-31	116164
2009-03-31	102753
2009-06-30	88734
2009-09-30	83952
2009-12-31	63122
2010-03-31	48952
2010-06-30	43435
2010-09-30	41605
2010-12-31	41770
2011-03-31	37278
2011-06-30	36798
2011-09-30	38908
2011-12-31	46191
2012-03-31	40213
2012-06-30	38792
2012-09-30	50744
2012-12-31	38974
2013-03-31	38018
2013-06-30	38328
2013-09-30	39529
2013-12-31	49109
2014-03-31	39332
2014-06-30	54025
2014-09-30	46040
2014-12-31	56366
2015-03-31	66545
2015-06-30	63804
2015-09-30	57935
2015-12-31	65415
2016-03-31	61580
2016-06-30	55806
2016-09-30	68333
2016-12-31	66348
2017-03-31	70541
2017-06-30	61175
2017-09-30	57525
2017-12-31	67592
2018-03-31	65269
2018-06-30	52901
2018-09-30	48356
2018-12-31	59985
2019-03-31	51850
2019-06-30	46338
2019-09-30	39690
2019-12-31	62195
2020-03-31	49117
2020-06-30	50280
2020-09-30	61485
2020-12-31	66263
2021-03-31	63094
2021-06-30	60535
2021-09-30	68127
2021-12-31	72010
2022-03-31	72281
2022-06-30	78272
2022-09-30	77979
2022-12-31	85086
2023-03-31	81879
2023-06-30	87467
2023-09-30	78597