Quarter	US dollars
1999-03-31	9251
1999-06-30	7974
1999-09-30	7689
1999-12-31	9192
2000-03-31	10305
2000-06-30	9317
2000-09-30	8968
2000-12-31	9094
2001-03-31	9339
2001-06-30	9888
2001-09-30	12058
2001-12-31	13814
2002-03-31	13585
2002-06-30	17529
2002-09-30	19204
2002-12-31	20537
2003-03-31	21341
2003-06-30	23617
2003-09-30	26082
2003-12-31	30062
2004-03-31	31814
2004-06-30	31575
2004-09-30	34647
2004-12-31	37366
2005-03-31	36962
2005-06-30	37694
2005-09-30	42070
2005-12-31	41877
2006-03-31	41994
2006-06-30	45367
2006-09-30	48765
2006-12-31	55805
2007-03-31	56134
2007-06-30	58324
2007-09-30	65245
2007-12-31	90096
2008-03-31	85522
2008-06-30	95428
2008-09-30	87158
2008-12-31	82674
2009-03-31	81273
2009-06-30	81732
2009-09-30	75458
2009-12-31	67649
2010-03-31	69777
2010-06-30	61955
2010-09-30	67918
2010-12-31	67798
2011-03-31	67382
2011-06-30	65802
2011-09-30	62936
2011-12-31	58220
2012-03-31	67460
2012-06-30	63907
2012-09-30	58991
2012-12-31	61782
2013-03-31	53538
2013-06-30	47694
2013-09-30	43958
2013-12-31	49096
2014-03-31	49318
2014-06-30	49710
2014-09-30	47532
2014-12-31	45415
2015-03-31	46413
2015-06-30	51202
2015-09-30	47868
2015-12-31	46681
2016-03-31	56896
2016-06-30	57524
2016-09-30	54594
2016-12-31	49898
2017-03-31	58034
2017-06-30	63109
2017-09-30	59249
2017-12-31	57721
2018-03-31	60783
2018-06-30	61428
2018-09-30	57965
2018-12-31	58563
2019-03-31	52215
2019-06-30	57122
2019-09-30	60743
2019-12-31	65072
2020-03-31	59034
2020-06-30	55459
2020-09-30	60155
2020-12-31	61399
2021-03-31	58908
2021-06-30	62343
2021-09-30	63781
2021-12-31	62997
2022-03-31	60746
2022-06-30	62645
2022-09-30	58877
2022-12-31	60821
2023-03-31	60599
2023-06-30	63349
2023-09-30	62471