Quarter	US dollars
2004-12-31	4314
2005-03-31	8025
2005-06-30	16055
2005-09-30	18799
2005-12-31	8677
2006-03-31	13160
2006-06-30	11995
2006-09-30	11676
2006-12-31	9638
2007-03-31	11870
2007-06-30	12540
2007-09-30	14060
2007-12-31	20554
2008-03-31	24822
2008-06-30	18739
2008-09-30	20694
2008-12-31	12832
2009-03-31	14845
2009-06-30	15877
2009-09-30	17117
2009-12-31	17584
2010-03-31	20718
2010-06-30	21304
2010-09-30	24822
2010-12-31	17729
2011-03-31	22129
2011-06-30	23530
2011-09-30	19321
2011-12-31	21482
2012-03-31	23882
2012-06-30	20469
2012-09-30	16467
2012-12-31	19673
2013-03-31	21105
2013-06-30	15954
2013-09-30	15571
2013-12-31	14469
2014-03-31	14904
2014-06-30	16338
2014-09-30	17212
2014-12-31	15897
2015-03-31	15003
2015-06-30	15372
2015-09-30	14335
2015-12-31	11935
2016-03-31	13162
2016-06-30	12498
2016-09-30	13887
2016-12-31	12438
2017-03-31	16513
2017-06-30	22089
2017-09-30	20747
2017-12-31	23420
2018-03-31	23738
2018-06-30	23330
2018-09-30	21844
2018-12-31	22731
2019-03-31	22792
2019-06-30	22768
2019-09-30	21480
2019-12-31	22222
2020-03-31	23662
2020-06-30	26841
2020-09-30	24275
2020-12-31	26060
2021-03-31	25427
2021-06-30	29448
2021-09-30	26906
2021-12-31	26249
2022-03-31	30569
2022-06-30	28903
2022-09-30	25479
2022-12-31	31209
2023-03-31	30916
2023-06-30	26907
2023-09-30	24921