Quarter	US dollars
1999-03-31	50746
1999-06-30	36437
1999-09-30	42892
1999-12-31	49158
2000-03-31	51827
2000-06-30	54022
2000-09-30	48416
2000-12-31	56283
2001-03-31	62519
2001-06-30	63152
2001-09-30	48166
2001-12-31	47575
2002-03-31	53828
2002-06-30	67030
2002-09-30	63842
2002-12-31	63398
2003-03-31	72862
2003-06-30	67488
2003-09-30	40615
2003-12-31	59111
2004-03-31	65689
2004-06-30	67245
2004-09-30	70954
2004-12-31	72931
2005-03-31	79900
2005-06-30	66234
2005-09-30	74614
2005-12-31	69637
2006-03-31	61404
2006-06-30	57798
2006-09-30	66752
2006-12-31	78254
2007-03-31	99498
2007-06-30	116115
2007-09-30	120017
2007-12-31	108379
2008-03-31	128081
2008-06-30	99216
2008-09-30	103230
2008-12-31	92379
2009-03-31	100243
2009-06-30	79285
2009-09-30	79064
2009-12-31	76225
2010-03-31	74154
2010-06-30	71774
2010-09-30	74553
2010-12-31	66556
2011-03-31	64701
2011-06-30	61717
2011-09-30	58701
2011-12-31	53294
2012-03-31	59611
2012-06-30	62538
2012-09-30	61031
2012-12-31	57480
2013-03-31	54303
2013-06-30	51043
2013-09-30	49996
2013-12-31	48612
2014-03-31	54893
2014-06-30	66824
2014-09-30	55084
2014-12-31	57144
2015-03-31	61370
2015-06-30	53967
2015-09-30	57377
2015-12-31	55967
2016-03-31	62864
2016-06-30	60133
2016-09-30	60854
2016-12-31	50978
2017-03-31	43668
2017-06-30	48705
2017-09-30	48545
2017-12-31	47842
2018-03-31	50329
2018-06-30	49806
2018-09-30	45521
2018-12-31	44658
2019-03-31	36796
2019-06-30	38085
2019-09-30	41961
2019-12-31	45873
2020-03-31	56630
2020-06-30	46327
2020-09-30	48879
2020-12-31	43152
2021-03-31	47014
2021-06-30	45785
2021-09-30	46667
2021-12-31	48500
2022-03-31	49993
2022-06-30	48062
2022-09-30	38873
2022-12-31	46608
2023-03-31	42613
2023-06-30	44952
2023-09-30	42491