Quarter	US dollars
1999-09-30	4469
1999-12-31	4449
2000-03-31	5909
2000-06-30	6012
2000-09-30	5739
2000-12-31	6738
2001-03-31	6873
2001-06-30	6881
2001-09-30	6703
2001-12-31	6291
2002-03-31	6447
2002-06-30	9054
2002-09-30	11381
2002-12-31	10085
2003-03-31	9148
2003-06-30	9416
2003-09-30	10467
2003-12-31	10485
2004-03-31	11389
2004-06-30	11883
2004-09-30	11732
2004-12-31	15582
2005-03-31	15877
2005-06-30	14892
2005-09-30	17524
2005-12-31	16093
2006-03-31	21123
2006-06-30	22295
2006-09-30	24399
2006-12-31	30269
2007-03-31	31859
2007-06-30	34303
2007-09-30	41255
2007-12-31	56225
2008-03-31	52460
2008-06-30	63421
2008-09-30	57763
2008-12-31	34489
2009-03-31	36587
2009-06-30	44291
2009-09-30	47776
2009-12-31	47488
2010-03-31	48125
2010-06-30	46795
2010-09-30	51691
2010-12-31	49966
2011-03-31	48980
2011-06-30	50748
2011-09-30	36961
2011-12-31	34302
2012-03-31	41766
2012-06-30	39326
2012-09-30	42449
2012-12-31	37948
2013-03-31	36135
2013-06-30	36060
2013-09-30	34574
2013-12-31	39485
2014-03-31	25743
2014-06-30	28574
2014-09-30	25226
2014-12-31	22955
2015-03-31	22924
2015-06-30	23054
2015-09-30	20273
2015-12-31	20865
2016-03-31	23627
2016-06-30	24615
2016-09-30	23992
2016-12-31	22641
2017-03-31	23098
2017-06-30	28035
2017-09-30	26533
2017-12-31	26363
2018-03-31	27401
2018-06-30	24253
2018-09-30	22434
2018-12-31	22632
2019-03-31	24954
2019-06-30	23063
2019-09-30	21615
2019-12-31	24177
2020-03-31	23664
2020-06-30	22774
2020-09-30	25403
2020-12-31	28544
2021-03-31	26659
2021-06-30	28797
2021-09-30	28311
2021-12-31	27831
2022-03-31	27573
2022-06-30	29808
2022-09-30	27162
2022-12-31	29006
2023-03-31	27282
2023-06-30	29689
2023-09-30	28826