Quarter	US dollars
2004-12-31	4385
2005-03-31	4739
2005-06-30	5646
2005-09-30	5956
2005-12-31	5946
2006-03-31	6596
2006-06-30	6695
2006-09-30	7137
2006-12-31	7754
2007-03-31	8330
2007-06-30	9673
2007-09-30	10741
2007-12-31	12208
2008-03-31	12774
2008-06-30	13722
2008-09-30	13376
2008-12-31	12072
2009-03-31	11306
2009-06-30	11498
2009-09-30	12395
2009-12-31	11639
2010-03-31	11818
2010-06-30	13674
2010-09-30	14685
2010-12-31	14376
2011-03-31	15964
2011-06-30	16693
2011-09-30	15708
2011-12-31	15868
2012-03-31	16384
2012-06-30	16731
2012-09-30	17507
2012-12-31	16157
2013-03-31	16024
2013-06-30	16239
2013-09-30	16131
2013-12-31	15750
2014-03-31	15941
2014-06-30	16702
2014-09-30	15114
2014-12-31	15191
2015-03-31	14283
2015-06-30	13684
2015-09-30	12851
2015-12-31	12347
2016-03-31	12440
2016-06-30	11334
2016-09-30	10336
2016-12-31	9274
2017-03-31	9331
2017-06-30	8902
2017-09-30	8904
2017-12-31	8615
2018-03-31	7981
2018-06-30	7039
2018-09-30	6668
2018-12-31	6073
2019-03-31	5772
2019-06-30	6191
2019-09-30	5954
2019-12-31	5584
2020-03-31	5242
2020-06-30	5049
2020-09-30	5380
2020-12-31	5348
2021-03-31	5052
2021-06-30	4729
2021-09-30	4411
2021-12-31	4144
2022-03-31	4476
2022-06-30	3836
2022-09-30	3813
2022-12-31	4176
2023-03-31	3916
2023-06-30	3616
2023-09-30	3545