Quarter	US dollars
2004-12-31	15238
2005-03-31	15486
2005-06-30	14562
2005-09-30	17173
2005-12-31	15784
2006-03-31	19985
2006-06-30	21638
2006-09-30	23848
2006-12-31	28962
2007-03-31	30253
2007-06-30	31870
2007-09-30	39638
2007-12-31	54306
2008-03-31	50606
2008-06-30	62133
2008-09-30	56698
2008-12-31	33375
2009-03-31	35740
2009-06-30	43337
2009-09-30	46834
2009-12-31	46401
2010-03-31	46918
2010-06-30	44733
2010-09-30	49735
2010-12-31	47247
2011-03-31	47130
2011-06-30	49178
2011-09-30	35906
2011-12-31	33473
2012-03-31	41089
2012-06-30	39061
2012-09-30	42146
2012-12-31	37652
2013-03-31	35932
2013-06-30	35744
2013-09-30	34373
2013-12-31	38960
2014-03-31	25463
2014-06-30	28234
2014-09-30	24673
2014-12-31	22435
2015-03-31	22382
2015-06-30	22439
2015-09-30	20082
2015-12-31	20619
2016-03-31	23583
2016-06-30	24554
2016-09-30	23905
2016-12-31	22590
2017-03-31	23054
2017-06-30	26828
2017-09-30	25309
2017-12-31	25106
2018-03-31	26202
2018-06-30	23456
2018-09-30	21729
2018-12-31	21850
2019-03-31	24098
2019-06-30	21745
2019-09-30	19730
2019-12-31	22386
2020-03-31	22188
2020-06-30	21349
2020-09-30	23931
2020-12-31	26375
2021-03-31	24088
2021-06-30	26568
2021-09-30	26016
2021-12-31	25236
2022-03-31	24795
2022-06-30	28182
2022-09-30	25540
2022-12-31	27155
2023-03-31	25276
2023-06-30	27181
2023-09-30	27409