Quarter	US dollars
1999-09-30	4309
1999-12-31	4485
2000-03-31	4439
2000-06-30	4318
2000-09-30	4203
2000-12-31	4410
2001-03-31	4114
2001-06-30	3742
2001-09-30	3956
2001-12-31	3328
2002-03-31	3519
2002-06-30	3560
2002-09-30	3650
2002-12-31	3578
2003-03-31	3441
2003-06-30	4053
2003-09-30	4067
2003-12-31	4202
2004-03-31	4312
2004-06-30	3972
2004-09-30	4263
2004-12-31	4886
2005-03-31	5518
2005-06-30	5668
2005-09-30	6012
2005-12-31	5601
2006-03-31	5965
2006-06-30	6099
2006-09-30	6363
2006-12-31	6311
2007-03-31	6592
2007-06-30	8555
2007-09-30	8398
2007-12-31	7645
2008-03-31	9526
2008-06-30	9660
2008-09-30	10046
2008-12-31	8420
2009-03-31	8282
2009-06-30	10162
2009-09-30	9610
2009-12-31	9757
2010-03-31	12783
2010-06-30	14013
2010-09-30	16815
2010-12-31	16413
2011-03-31	18031
2011-06-30	18970
2011-09-30	19145
2011-12-31	18281
2012-03-31	20176
2012-06-30	20467
2012-09-30	20304
2012-12-31	22425
2013-03-31	22254
2013-06-30	20750
2013-09-30	21166
2013-12-31	21288
2014-03-31	21328
2014-06-30	21961
2014-09-30	20724
2014-12-31	20840
2015-03-31	20559
2015-06-30	19405
2015-09-30	17592
2015-12-31	16849
2016-03-31	16824
2016-06-30	16949
2016-09-30	16871
2016-12-31	15637
2017-03-31	17571
2017-06-30	19459
2017-09-30	19165
2017-12-31	18449
2018-03-31	18014
2018-06-30	17064
2018-09-30	16366
2018-12-31	16593
2019-03-31	16716
2019-06-30	17323
2019-09-30	16578
2019-12-31	16763
2020-03-31	15488
2020-06-30	15436
2020-09-30	14671
2020-12-31	16547
2021-03-31	15405
2021-06-30	16005
2021-09-30	17060
2021-12-31	17742
2022-03-31	17199
2022-06-30	17735
2022-09-30	18113
2022-12-31	16372
2023-03-31	16630
2023-06-30	16991
2023-09-30	17279