Quarter	US dollars
1999-03-31	103377
1999-06-30	95650
1999-09-30	99216
1999-12-31	88240
2000-03-31	99376
2000-06-30	92900
2000-09-30	90947
2000-12-31	109674
2001-03-31	117027
2001-06-30	109354
2001-09-30	109530
2001-12-31	107803
2002-03-31	104239
2002-06-30	106826
2002-09-30	114959
2002-12-31	144615
2003-03-31	147203
2003-06-30	163638
2003-09-30	156286
2003-12-31	164633
2004-03-31	182783
2004-06-30	202481
2004-09-30	204346
2004-12-31	211541
2005-03-31	252914
2005-06-30	263432
2005-09-30	239609
2005-12-31	281371
2006-03-31	321273
2006-06-30	330320
2006-09-30	390348
2006-12-31	412599
2007-03-31	464584
2007-06-30	529341
2007-09-30	560293
2007-12-31	549029
2008-03-31	581911
2008-06-30	549979
2008-09-30	450232
2008-12-31	367782
2009-03-31	369082
2009-06-30	379648
2009-09-30	373882
2009-12-31	392532
2010-03-31	404182
2010-06-30	369330
2010-09-30	418048
2010-12-31	403083
2011-03-31	394327
2011-06-30	393862
2011-09-30	361697
2011-12-31	375136
2012-03-31	314277
2012-06-30	331153
2012-09-30	324111
2012-12-31	316232
2013-03-31	324005
2013-06-30	322689
2013-09-30	346021
2013-12-31	331741
2014-03-31	354835
2014-06-30	349487
2014-09-30	325157
2014-12-31	318867
2015-03-31	298949
2015-06-30	310365
2015-09-30	326265
2015-12-31	296628
2016-03-31	303384
2016-06-30	306141
2016-09-30	323790
2016-12-31	312798
2017-03-31	335085
2017-06-30	347957
2017-09-30	416938
2017-12-31	408240
2018-03-31	393144
2018-06-30	381288
2018-09-30	424518
2018-12-31	440689
2019-03-31	463558
2019-06-30	486531
2019-09-30	443039
2019-12-31	435575
2020-03-31	455982
2020-06-30	416757
2020-09-30	442201
2020-12-31	486003
2021-03-31	468777
2021-06-30	468370
2021-09-30	427990
2021-12-31	417536
2022-03-31	448874
2022-06-30	457867
2022-09-30	446186
2022-12-31	474398
2023-03-31	458512
2023-06-30	443600
2023-09-30	429760