Quarter	US dollars
2004-12-31	27585
2005-03-31	38076
2005-06-30	28655
2005-09-30	33968
2005-12-31	36751
2006-03-31	41904
2006-06-30	43063
2006-09-30	49219
2006-12-31	51127
2007-03-31	58708
2007-06-30	57279
2007-09-30	60869
2007-12-31	54742
2008-03-31	57822
2008-06-30	54523
2008-09-30	47243
2008-12-31	44909
2009-03-31	39564
2009-06-30	40399
2009-09-30	33576
2009-12-31	32130
2010-03-31	34174
2010-06-30	39341
2010-09-30	48677
2010-12-31	50400
2011-03-31	61451
2011-06-30	60907
2011-09-30	60045
2011-12-31	56943
2012-03-31	54602
2012-06-30	64123
2012-09-30	79506
2012-12-31	86465
2013-03-31	85651
2013-06-30	80610
2013-09-30	81981
2013-12-31	82194
2014-03-31	72841
2014-06-30	63124
2014-09-30	69684
2014-12-31	59360
2015-03-31	57755
2015-06-30	57779
2015-09-30	59310
2015-12-31	53975
2016-03-31	49522
2016-06-30	59359
2016-09-30	60363
2016-12-31	53337
2017-03-31	54202
2017-06-30	57812
2017-09-30	49492
2017-12-31	54824
2018-03-31	47777
2018-06-30	44115
2018-09-30	44903
2018-12-31	46625
2019-03-31	48724
2019-06-30	39965
2019-09-30	52569
2019-12-31	56614
2020-03-31	36408
2020-06-30	50529
2020-09-30	63910
2020-12-31	74541
2021-03-31	68060
2021-06-30	63042
2021-09-30	60001
2021-12-31	79148
2022-03-31	54984
2022-06-30	42253
2022-09-30	28997
2022-12-31	32773
2023-03-31	34013
2023-06-30	43470
2023-09-30	44206