Quarter	US dollars
2004-12-31	23870
2005-03-31	19110
2005-06-30	27821
2005-09-30	21562
2005-12-31	19943
2006-03-31	23565
2006-06-30	27573
2006-09-30	23556
2006-12-31	20856
2007-03-31	27860
2007-06-30	20760
2007-09-30	21764
2007-12-31	21458
2008-03-31	25679
2008-06-30	23197
2008-09-30	22601
2008-12-31	14945
2009-03-31	20005
2009-06-30	19577
2009-09-30	20471
2009-12-31	16492
2010-03-31	12249
2010-06-30	14018
2010-09-30	12402
2010-12-31	11497
2011-03-31	12734
2011-06-30	17430
2011-09-30	8517
2011-12-31	8445
2012-03-31	6659
2012-06-30	6262
2012-09-30	4480
2012-12-31	6797
2013-03-31	5104
2013-06-30	4816
2013-09-30	5668
2013-12-31	4053
2014-03-31	4528
2014-06-30	5245
2014-09-30	5940
2014-12-31	2674
2015-03-31	6132
2015-06-30	228
2015-09-30	5547
2015-12-31	4225
2016-03-31	6722
2016-06-30	1096
2016-09-30	1330
2016-12-31	-496
2017-03-31	1124
2017-06-30	1022
2017-09-30	2530
2017-12-31	-123
2018-03-31	5512
2018-06-30	3941
2018-09-30	3548
2018-12-31	5198
2019-03-31	7159
2019-06-30	7875
2019-09-30	6953
2019-12-31	4247
2020-03-31	6796
2020-06-30	5543
2020-09-30	6723
2020-12-31	3636
2021-03-31	2708
2021-06-30	2975
2021-09-30	692
2021-12-31	-853
2022-03-31	2176
2022-06-30	4712
2022-09-30	2643
2022-12-31	1320
2023-03-31	-1044
2023-06-30	1776
2023-09-30	3994