Quarter	US dollars
2004-12-31	1019
2005-03-31	1733
2005-06-30	1685
2005-09-30	6812
2005-12-31	7141
2006-03-31	7101
2006-06-30	7111
2006-09-30	6963
2006-12-31	7133
2007-03-31	7890
2007-06-30	8375
2007-09-30	8812
2007-12-31	9073
2008-03-31	10424
2008-06-30	10076
2008-09-30	9221
2008-12-31	8938
2009-03-31	9040
2009-06-30	8619
2009-09-30	9001
2009-12-31	8781
2010-03-31	9197
2010-06-30	9728
2010-09-30	11033
2010-12-31	11361
2011-03-31	7465
2011-06-30	8258
2011-09-30	7501
2011-12-31	7225
2012-03-31	7570
2012-06-30	7688
2012-09-30	7498
2012-12-31	7806
2013-03-31	7959
2013-06-30	8016
2013-09-30	7535
2013-12-31	6267
2014-03-31	7271
2014-06-30	6593
2014-09-30	6193
2014-12-31	6004
2015-03-31	5813
2015-06-30	6075
2015-09-30	5333
2015-12-31	5516
2016-03-31	6019
2016-06-30	5745
2016-09-30	6532
2016-12-31	6540
2017-03-31	5804
2017-06-30	5765
2017-09-30	6075
2017-12-31	4987
2018-03-31	5243
2018-06-30	5459
2018-09-30	5578
2018-12-31	5967
2019-03-31	5199
2019-06-30	5109
2019-09-30	5221
2019-12-31	5645
2020-03-31	4867
2020-06-30	4509
2020-09-30	4566
2020-12-31	5442
2021-03-31	4328
2021-06-30	5072
2021-09-30	4752
2021-12-31	4442
2022-03-31	4155
2022-06-30	4320
2022-09-30	4901
2022-12-31	4107
2023-03-31	4243
2023-06-30	3764
2023-09-30	3431