Quarter	US dollars
1999-09-30	3713
1999-12-31	3672
2000-03-31	3439
2000-06-30	3832
2000-09-30	3988
2000-12-31	4374
2001-03-31	4756
2001-06-30	5588
2001-09-30	6325
2001-12-31	6894
2002-03-31	6740
2002-06-30	8311
2002-09-30	8750
2002-12-31	9609
2003-03-31	9504
2003-06-30	11099
2003-09-30	11912
2003-12-31	13268
2004-03-31	14253
2004-06-30	13271
2004-09-30	13768
2004-12-31	13614
2005-03-31	12997
2005-06-30	13822
2005-09-30	15811
2005-12-31	13953
2006-03-31	12532
2006-06-30	13110
2006-09-30	11557
2006-12-31	12961
2007-03-31	14667
2007-06-30	15267
2007-09-30	16267
2007-12-31	16413
2008-03-31	23973
2008-06-30	26357
2008-09-30	23937
2008-12-31	20372
2009-03-31	22581
2009-06-30	24155
2009-09-30	24535
2009-12-31	24262
2010-03-31	23748
2010-06-30	22385
2010-09-30	25430
2010-12-31	24358
2011-03-31	26655
2011-06-30	25630
2011-09-30	23504
2011-12-31	21214
2012-03-31	19756
2012-06-30	17998
2012-09-30	17586
2012-12-31	17193
2013-03-31	16657
2013-06-30	14917
2013-09-30	14578
2013-12-31	15326
2014-03-31	15229
2014-06-30	14008
2014-09-30	12013
2014-12-31	11714
2015-03-31	10415
2015-06-30	10512
2015-09-30	10377
2015-12-31	9554
2016-03-31	9096
2016-06-30	4703
2016-09-30	4088
2016-12-31	2324
2017-03-31	2449
2017-06-30	3133
2017-09-30	1995
2017-12-31	1564
2018-03-31	2550
2018-06-30	3038
2018-09-30	2094
2018-12-31	1573
2019-03-31	1922
2019-06-30	2370
2019-09-30	1879
2019-12-31	2469
2020-03-31	2674
2020-06-30	2379
2020-09-30	1811
2020-12-31	1129
2021-03-31	1146
2021-06-30	745
2021-09-30	1169
2021-12-31	1057
2022-03-31	937
2022-06-30	1065
2022-09-30	1042
2022-12-31	1387
2023-03-31	1164
2023-06-30	2608
2023-09-30	2540