Quarter	US dollars
1999-09-30	20354
1999-12-31	21607
2000-03-31	22537
2000-06-30	23332
2000-09-30	23347
2000-12-31	26130
2001-03-31	25531
2001-06-30	25066
2001-09-30	25617
2001-12-31	25595
2002-03-31	26662
2002-06-30	27641
2002-09-30	29599
2002-12-31	29902
2003-03-31	29202
2003-06-30	29842
2003-09-30	31288
2003-12-31	35529
2004-03-31	37267
2004-06-30	36706
2004-09-30	39635
2004-12-31	43860
2005-03-31	46523
2005-06-30	47456
2005-09-30	100409
2005-12-31	102280
2006-03-31	117944
2006-06-30	111772
2006-09-30	115051
2006-12-31	125385
2007-03-31	138207
2007-06-30	148855
2007-09-30	176082
2007-12-31	188636
2008-03-31	195494
2008-06-30	200582
2008-09-30	201295
2008-12-31	177781
2009-03-31	180626
2009-06-30	192993
2009-09-30	194931
2009-12-31	199467
2010-03-31	210773
2010-06-30	212187
2010-09-30	224747
2010-12-31	237244
2011-03-31	233612
2011-06-30	234930
2011-09-30	225950
2011-12-31	218113
2012-03-31	227013
2012-06-30	228253
2012-09-30	228294
2012-12-31	223605
2013-03-31	214421
2013-06-30	206835
2013-09-30	213656
2013-12-31	203413
2014-03-31	212667
2014-06-30	212446
2014-09-30	210920
2014-12-31	209711
2015-03-31	208799
2015-06-30	211675
2015-09-30	208220
2015-12-31	203861
2016-03-31	197463
2016-06-30	197872
2016-09-30	202541
2016-12-31	194871
2017-03-31	199345
2017-06-30	149273
2017-09-30	151980
2017-12-31	154411
2018-03-31	159126
2018-06-30	147570
2018-09-30	147189
2018-12-31	149946
2019-03-31	156664
2019-06-30	159105
2019-09-30	159156
2019-12-31	162531
2020-03-31	164150
2020-06-30	161598
2020-09-30	154088
2020-12-31	164853
2021-03-31	159653
2021-06-30	162065
2021-09-30	160508
2021-12-31	169344
2022-03-31	167934
2022-06-30	165305
2022-09-30	163250
2022-12-31	163543
2023-03-31	167335
2023-06-30	164128
2023-09-30	154776