Quarter	US dollars
2004-12-31	6121
2005-03-31	6836
2005-06-30	7706
2005-09-30	9076
2005-12-31	9539
2006-03-31	10879
2006-06-30	10477
2006-09-30	11041
2006-12-31	13133
2007-03-31	14247
2007-06-30	17676
2007-09-30	19418
2007-12-31	22234
2008-03-31	24126
2008-06-30	25923
2008-09-30	24816
2008-12-31	21751
2009-03-31	19500
2009-06-30	20236
2009-09-30	21886
2009-12-31	19668
2010-03-31	19843
2010-06-30	26115
2010-09-30	28266
2010-12-31	27235
2011-03-31	30072
2011-06-30	31422
2011-09-30	28882
2011-12-31	28458
2012-03-31	30009
2012-06-30	30054
2012-09-30	30300
2012-12-31	28157
2013-03-31	28133
2013-06-30	27985
2013-09-30	28304
2013-12-31	30729
2014-03-31	28599
2014-06-30	30183
2014-09-30	27431
2014-12-31	25347
2015-03-31	23483
2015-06-30	22842
2015-09-30	20230
2015-12-31	19122
2016-03-31	19117
2016-06-30	17427
2016-09-30	15757
2016-12-31	14300
2017-03-31	14747
2017-06-30	14037
2017-09-30	14960
2017-12-31	13775
2018-03-31	13815
2018-06-30	12153
2018-09-30	11344
2018-12-31	10824
2019-03-31	10238
2019-06-30	11086
2019-09-30	10575
2019-12-31	9996
2020-03-31	9648
2020-06-30	9072
2020-09-30	9477
2020-12-31	9763
2021-03-31	9137
2021-06-30	7953
2021-09-30	7755
2021-12-31	7856
2022-03-31	7475
2022-06-30	6373
2022-09-30	6133
2022-12-31	6876
2023-03-31	6748
2023-06-30	6575
2023-09-30	6247