Quarter	US dollars
2004-12-31	7438
2005-03-31	7868
2005-06-30	8188
2005-09-30	7581
2005-12-31	8969
2006-03-31	9717
2006-06-30	9937
2006-09-30	10006
2006-12-31	10533
2007-03-31	11209
2007-06-30	11972
2007-09-30	16299
2007-12-31	18456
2008-03-31	19575
2008-06-30	19334
2008-09-30	16508
2008-12-31	16873
2009-03-31	15912
2009-06-30	14581
2009-09-30	15897
2009-12-31	15657
2010-03-31	15543
2010-06-30	17396
2010-09-30	19144
2010-12-31	19578
2011-03-31	21886
2011-06-30	20211
2011-09-30	22960
2011-12-31	25486
2012-03-31	25389
2012-06-30	26847
2012-09-30	26504
2012-12-31	28435
2013-03-31	29644
2013-06-30	28358
2013-09-30	29904
2013-12-31	30210
2014-03-31	30333
2014-06-30	32660
2014-09-30	33136
2014-12-31	34625
2015-03-31	35260
2015-06-30	33817
2015-09-30	28101
2015-12-31	25803
2016-03-31	26381
2016-06-30	25765
2016-09-30	25544
2016-12-31	26483
2017-03-31	25659
2017-06-30	28006
2017-09-30	29248
2017-12-31	29688
2018-03-31	30480
2018-06-30	30513
2018-09-30	27411
2018-12-31	26957
2019-03-31	27411
2019-06-30	27478
2019-09-30	26095
2019-12-31	25289
2020-03-31	25105
2020-06-30	24966
2020-09-30	23553
2020-12-31	23422
2021-03-31	24053
2021-06-30	24493
2021-09-30	24398
2021-12-31	23856
2022-03-31	24496
2022-06-30	23616
2022-09-30	23756
2022-12-31	25472
2023-03-31	22714
2023-06-30	22377
2023-09-30	22086