Quarter	US dollars
1999-03-31	1345
1999-06-30	1255
1999-09-30	1396
1999-12-31	1382
2000-03-31	1613
2000-06-30	1411
2000-09-30	1475
2000-12-31	1714
2001-03-31	1714
2001-06-30	1897
2001-09-30	1991
2001-12-31	1942
2002-03-31	2057
2002-06-30	2113
2002-09-30	2154
2002-12-31	1905
2003-03-31	2061
2003-06-30	2203
2003-09-30	2173
2003-12-31	3209
2004-03-31	2876
2004-06-30	3241
2004-09-30	3347
2004-12-31	2973
2005-03-31	2542
2005-06-30	2575
2005-09-30	2709
2005-12-31	2700
2006-03-31	3244
2006-06-30	3245
2006-09-30	3668
2006-12-31	3315
2007-03-31	3614
2007-06-30	3953
2007-09-30	4162
2007-12-31	5082
2008-03-31	3973
2008-06-30	4900
2008-09-30	4663
2008-12-31	4437
2009-03-31	5160
2009-06-30	4186
2009-09-30	4456
2009-12-31	4685
2010-03-31	5228
2010-06-30	4784
2010-09-30	3455
2010-12-31	4244
2011-03-31	4787
2011-06-30	6033
2011-09-30	6279
2011-12-31	6261
2012-03-31	7238
2012-06-30	8187
2012-09-30	4976
2012-12-31	5614
2013-03-31	5377
2013-06-30	6580
2013-09-30	5266
2013-12-31	6029
2014-03-31	5800
2014-06-30	5765
2014-09-30	5382
2014-12-31	6902
2015-03-31	4881
2015-06-30	5114
2015-09-30	4331
2015-12-31	4498
2016-03-31	4370
2016-06-30	3799
2016-09-30	4294
2016-12-31	3968
2017-03-31	3919
2017-06-30	3485
2017-09-30	3714
2017-12-31	3645
2018-03-31	4608
2018-06-30	4157
2018-09-30	4278
2018-12-31	4267
2019-03-31	4139
2019-06-30	4301
2019-09-30	5191
2019-12-31	5919
2020-03-31	5875
2020-06-30	5956
2020-09-30	5923
2020-12-31	6525
2021-03-31	7427
2021-06-30	6827
2021-09-30	5883
2021-12-31	6390
2022-03-31	6149
2022-06-30	6106
2022-09-30	6253
2022-12-31	6219
2023-03-31	6474
2023-06-30	5477
2023-09-30	5655