Quarter	US dollars
2004-12-31	29065
2005-03-31	32209
2005-06-30	30270
2005-09-30	34566
2005-12-31	29431
2006-03-31	34156
2006-06-30	32019
2006-09-30	37097
2006-12-31	37545
2007-03-31	56572
2007-06-30	52247
2007-09-30	55505
2007-12-31	54314
2008-03-31	66909
2008-06-30	56121
2008-09-30	50681
2008-12-31	37425
2009-03-31	29796
2009-06-30	31391
2009-09-30	40130
2009-12-31	37126
2010-03-31	42577
2010-06-30	32571
2010-09-30	41264
2010-12-31	31944
2011-03-31	30978
2011-06-30	34553
2011-09-30	38059
2011-12-31	37586
2012-03-31	31206
2012-06-30	28858
2012-09-30	27988
2012-12-31	27731
2013-03-31	27887
2013-06-30	27070
2013-09-30	24215
2013-12-31	25280
2014-03-31	22352
2014-06-30	23843
2014-09-30	19308
2014-12-31	17203
2015-03-31	17935
2015-06-30	12706
2015-09-30	9942
2015-12-31	9726
2016-03-31	8932
2016-06-30	8098
2016-09-30	7685
2016-12-31	7518
2017-03-31	7328
2017-06-30	5894
2017-09-30	6987
2017-12-31	9691
2018-03-31	11962
2018-06-30	8791
2018-09-30	12195
2018-12-31	14951
2019-03-31	9719
2019-06-30	14715
2019-09-30	15115
2019-12-31	13106
2020-03-31	13052
2020-06-30	13036
2020-09-30	13768
2020-12-31	15187
2021-03-31	12851
2021-06-30	10142
2021-09-30	12128
2021-12-31	9764
2022-03-31	8850
2022-06-30	10089
2022-09-30	8894
2022-12-31	6218
2023-03-31	5891
2023-06-30	5763
2023-09-30	6265