Quarter	US dollars
1999-03-31	22665
1999-06-30	21938
1999-09-30	25293
1999-12-31	25356
2000-03-31	24700
2000-06-30	25859
2000-09-30	33803
2000-12-31	35613
2001-03-31	33595
2001-06-30	41999
2001-09-30	41132
2001-12-31	42854
2002-03-31	43351
2002-06-30	43532
2002-09-30	43524
2002-12-31	46441
2003-03-31	55246
2003-06-30	63066
2003-09-30	58191
2003-12-31	58891
2004-03-31	76403
2004-06-30	78972
2004-09-30	75376
2004-12-31	76851
2005-03-31	79094
2005-06-30	64924
2005-09-30	62134
2005-12-31	73232
2006-03-31	82397
2006-06-30	89557
2006-09-30	92485
2006-12-31	106094
2007-03-31	135715
2007-06-30	128711
2007-09-30	122592
2007-12-31	111792
2008-03-31	131025
2008-06-30	125825
2008-09-30	125995
2008-12-31	122265
2009-03-31	127206
2009-06-30	118418
2009-09-30	129748
2009-12-31	107250
2010-03-31	127733
2010-06-30	125799
2010-09-30	137984
2010-12-31	129891
2011-03-31	135874
2011-06-30	156347
2011-09-30	187216
2011-12-31	154213
2012-03-31	163420
2012-06-30	167569
2012-09-30	142859
2012-12-31	133204
2013-03-31	144051
2013-06-30	145866
2013-09-30	130847
2013-12-31	126789
2014-03-31	120376
2014-06-30	129830
2014-09-30	121348
2014-12-31	109172
2015-03-31	123847
2015-06-30	119722
2015-09-30	109273
2015-12-31	94964
2016-03-31	105431
2016-06-30	93645
2016-09-30	91510
2016-12-31	72650
2017-03-31	80789
2017-06-30	82329
2017-09-30	79843
2017-12-31	77365
2018-03-31	84152
2018-06-30	77758
2018-09-30	74306
2018-12-31	71980
2019-03-31	62844
2019-06-30	68320
2019-09-30	67815
2019-12-31	67726
2020-03-31	74838
2020-06-30	83751
2020-09-30	74446
2020-12-31	81637
2021-03-31	78348
2021-06-30	72395
2021-09-30	77325
2021-12-31	82409
2022-03-31	66772
2022-06-30	54950
2022-09-30	42205
2022-12-31	48699
2023-03-31	48401
2023-06-30	45143
2023-09-30	52288