Quarter	US dollars
1999-03-31	78980
1999-06-30	75170
1999-09-30	78600
1999-12-31	78977
2000-03-31	82651
2000-06-30	85400
2000-09-30	93840
2000-12-31	99161
2001-03-31	108656
2001-06-30	107933
2001-09-30	109710
2001-12-31	100960
2002-03-31	92973
2002-06-30	96108
2002-09-30	94542
2002-12-31	101345
2003-03-31	107189
2003-06-30	102270
2003-09-30	105021
2003-12-31	111253
2004-03-31	119357
2004-06-30	118208
2004-09-30	137256
2004-12-31	131306
2005-03-31	131686
2005-06-30	143309
2005-09-30	162408
2005-12-31	159911
2006-03-31	180680
2006-06-30	189245
2006-09-30	211589
2006-12-31	218336
2007-03-31	222209
2007-06-30	226243
2007-09-30	247207
2007-12-31	299937
2008-03-31	303914
2008-06-30	270832
2008-09-30	279904
2008-12-31	255681
2009-03-31	212291
2009-06-30	216018
2009-09-30	216215
2009-12-31	226252
2010-03-31	218541
2010-06-30	213531
2010-09-30	202173
2010-12-31	212804
2011-03-31	237568
2011-06-30	240615
2011-09-30	238371
2011-12-31	243568
2012-03-31	285937
2012-06-30	302494
2012-09-30	269960
2012-12-31	253995
2013-03-31	261718
2013-06-30	248497
2013-09-30	260073
2013-12-31	257221
2014-03-31	269092
2014-06-30	265664
2014-09-30	263673
2014-12-31	253631
2015-03-31	238494
2015-06-30	248212
2015-09-30	254811
2015-12-31	244657
2016-03-31	235584
2016-06-30	238399
2016-09-30	233060
2016-12-31	229805
2017-03-31	253441
2017-06-30	257966
2017-09-30	264928
2017-12-31	267353
2018-03-31	293360
2018-06-30	268900
2018-09-30	270179
2018-12-31	268923
2019-03-31	282419
2019-06-30	300805
2019-09-30	292734
2019-12-31	292716
2020-03-31	302809
2020-06-30	266545
2020-09-30	263399
2020-12-31	262940
2021-03-31	258742
2021-06-30	256304
2021-09-30	271624
2021-12-31	259784
2022-03-31	276595
2022-06-30	290724
2022-09-30	297640
2022-12-31	286632
2023-03-31	309719
2023-06-30	319797
2023-09-30	303420