Quarter	US dollars
2004-12-31	4523
2005-03-31	4957
2005-06-30	5924
2005-09-30	6343
2005-12-31	6410
2006-03-31	7101
2006-06-30	7279
2006-09-30	7729
2006-12-31	8474
2007-03-31	8900
2007-06-30	10339
2007-09-30	11369
2007-12-31	12811
2008-03-31	13356
2008-06-30	14526
2008-09-30	14086
2008-12-31	12603
2009-03-31	11837
2009-06-30	12028
2009-09-30	12793
2009-12-31	12763
2010-03-31	12884
2010-06-30	15224
2010-09-30	16100
2010-12-31	15605
2011-03-31	16581
2011-06-30	17121
2011-09-30	16233
2011-12-31	16426
2012-03-31	16900
2012-06-30	17096
2012-09-30	17963
2012-12-31	16606
2013-03-31	16414
2013-06-30	16244
2013-09-30	16123
2013-12-31	15855
2014-03-31	16181
2014-06-30	16675
2014-09-30	15230
2014-12-31	15460
2015-03-31	14520
2015-06-30	14055
2015-09-30	13213
2015-12-31	12608
2016-03-31	12707
2016-06-30	11639
2016-09-30	10737
2016-12-31	9406
2017-03-31	9423
2017-06-30	9513
2017-09-30	9315
2017-12-31	9200
2018-03-31	9085
2018-06-30	8158
2018-09-30	7403
2018-12-31	6754
2019-03-31	6541
2019-06-30	6499
2019-09-30	6415
2019-12-31	5983
2020-03-31	5702
2020-06-30	5613
2020-09-30	5884
2020-12-31	5892
2021-03-31	5470
2021-06-30	5257
2021-09-30	4680
2021-12-31	4334
2022-03-31	4726
2022-06-30	4108
2022-09-30	4093
2022-12-31	4485
2023-03-31	4243
2023-06-30	3939
2023-09-30	3768