Quarter	US dollars
2004-12-31	4648
2005-03-31	4520
2005-06-30	4209
2005-09-30	4319
2005-12-31	4413
2006-03-31	4472
2006-06-30	4816
2006-09-30	4689
2006-12-31	4609
2007-03-31	5148
2007-06-30	5760
2007-09-30	5680
2007-12-31	5724
2008-03-31	5887
2008-06-30	5932
2008-09-30	5459
2008-12-31	4911
2009-03-31	4748
2009-06-30	5520
2009-09-30	5717
2009-12-31	5455
2010-03-31	4590
2010-06-30	4456
2010-09-30	5325
2010-12-31	5359
2011-03-31	5091
2011-06-30	5504
2011-09-30	4744
2011-12-31	3899
2012-03-31	3898
2012-06-30	3816
2012-09-30	3575
2012-12-31	3471
2013-03-31	3558
2013-06-30	3155
2013-09-30	3286
2013-12-31	3456
2014-03-31	3421
2014-06-30	3801
2014-09-30	3414
2014-12-31	3811
2015-03-31	3842
2015-06-30	3220
2015-09-30	2875
2015-12-31	3033
2016-03-31	2958
2016-06-30	2899
2016-09-30	2998
2016-12-31	4999
2017-03-31	5164
2017-06-30	5518
2017-09-30	5553
2017-12-31	5850
2018-03-31	5850
2018-06-30	5545
2018-09-30	5386
2018-12-31	5408
2019-03-31	5461
2019-06-30	5640
2019-09-30	5569
2019-12-31	6038
2020-03-31	5584
2020-06-30	5463
2020-09-30	4602
2020-12-31	5159
2021-03-31	5189
2021-06-30	5143
2021-09-30	5159
2021-12-31	5023
2022-03-31	4630
2022-06-30	4372
2022-09-30	4164
2022-12-31	4653
2023-03-31	4632
2023-06-30	4507
2023-09-30	3386