Quarter	US dollars
2004-12-31	13981
2005-03-31	15403
2005-06-30	15462
2005-09-30	15436
2005-12-31	16004
2006-03-31	16878
2006-06-30	17133
2006-09-30	18732
2006-12-31	19750
2007-03-31	19633
2007-06-30	22702
2007-09-30	27588
2007-12-31	29921
2008-03-31	33064
2008-06-30	33284
2008-09-30	27592
2008-12-31	23132
2009-03-31	23295
2009-06-30	24399
2009-09-30	23502
2009-12-31	24279
2010-03-31	23501
2010-06-30	25566
2010-09-30	27953
2010-12-31	29380
2011-03-31	40500
2011-06-30	39605
2011-09-30	33330
2011-12-31	35328
2012-03-31	39348
2012-06-30	38183
2012-09-30	38662
2012-12-31	38386
2013-03-31	39295
2013-06-30	40071
2013-09-30	44543
2013-12-31	45951
2014-03-31	47245
2014-06-30	48544
2014-09-30	51635
2014-12-31	55252
2015-03-31	54288
2015-06-30	53153
2015-09-30	45150
2015-12-31	42876
2016-03-31	43181
2016-06-30	48974
2016-09-30	43554
2016-12-31	45146
2017-03-31	46506
2017-06-30	49463
2017-09-30	51064
2017-12-31	51511
2018-03-31	42081
2018-06-30	42330
2018-09-30	40898
2018-12-31	40928
2019-03-31	41891
2019-06-30	41274
2019-09-30	42080
2019-12-31	42482
2020-03-31	42794
2020-06-30	40414
2020-09-30	39772
2020-12-31	34013
2021-03-31	35018
2021-06-30	32701
2021-09-30	33955
2021-12-31	31639
2022-03-31	33883
2022-06-30	30955
2022-09-30	30463
2022-12-31	28250
2023-03-31	27820
2023-06-30	27590
2023-09-30	25644