Quarter	US dollars
1999-09-30	7851
1999-12-31	7869
2000-03-31	8644
2000-06-30	8002
2000-09-30	8210
2000-12-31	8137
2001-03-31	7676
2001-06-30	7473
2001-09-30	6906
2001-12-31	6348
2002-03-31	3324
2002-06-30	2925
2002-09-30	3035
2002-12-31	2809
2003-03-31	2742
2003-06-30	2558
2003-09-30	2475
2003-12-31	2544
2004-03-31	2404
2004-06-30	2200
2004-09-30	2193
2004-12-31	2041
2005-03-31	2089
2005-06-30	2181
2005-09-30	2163
2005-12-31	2070
2006-03-31	1930
2006-06-30	2872
2006-09-30	3109
2006-12-31	3403
2007-03-31	3532
2007-06-30	3806
2007-09-30	3940
2007-12-31	3936
2008-03-31	4452
2008-06-30	4695
2008-09-30	4578
2008-12-31	4395
2009-03-31	4314
2009-06-30	4273
2009-09-30	4040
2009-12-31	4239
2010-03-31	4652
2010-06-30	4821
2010-09-30	5377
2010-12-31	5788
2011-03-31	5564
2011-06-30	6255
2011-09-30	6736
2011-12-31	6681
2012-03-31	6875
2012-06-30	6925
2012-09-30	7096
2012-12-31	7114
2013-03-31	6716
2013-06-30	6755
2013-09-30	6423
2013-12-31	6043
2014-03-31	5467
2014-06-30	5755
2014-09-30	5977
2014-12-31	5703
2015-03-31	5952
2015-06-30	5952
2015-09-30	6339
2015-12-31	5430
2016-03-31	5702
2016-06-30	5917
2016-09-30	4876
2016-12-31	5041
2017-03-31	5528
2017-06-30	5544
2017-09-30	6344
2017-12-31	6735
2018-03-31	8240
2018-06-30	6978
2018-09-30	6174
2018-12-31	7472
2019-03-31	6545
2019-06-30	6775
2019-09-30	4551
2019-12-31	4995
2020-03-31	4574
2020-06-30	4517
2020-09-30	4576
2020-12-31	4375
2021-03-31	4070
2021-06-30	4828
2021-09-30	4994
2021-12-31	5121
2022-03-31	5740
2022-06-30	6049
2022-09-30	6590
2022-12-31	5843
2023-03-31	5752
2023-06-30	5969
2023-09-30	4951