Quarter	US dollars
1999-09-30	5747
1999-12-31	5673
2000-03-31	4947
2000-06-30	5917
2000-09-30	4902
2000-12-31	5696
2001-03-31	5120
2001-06-30	4639
2001-09-30	5174
2001-12-31	5087
2002-03-31	4865
2002-06-30	6387
2002-09-30	6621
2002-12-31	7430
2003-03-31	8317
2003-06-30	8023
2003-09-30	8453
2003-12-31	9477
2004-03-31	9993
2004-06-30	7436
2004-09-30	8481
2004-12-31	8311
2005-03-31	9698
2005-06-30	10135
2005-09-30	9923
2005-12-31	9087
2006-03-31	10029
2006-06-30	9221
2006-09-30	10654
2006-12-31	8830
2007-03-31	10864
2007-06-30	10048
2007-09-30	11609
2007-12-31	13753
2008-03-31	18408
2008-06-30	14938
2008-09-30	15463
2008-12-31	13115
2009-03-31	13577
2009-06-30	12639
2009-09-30	12342
2009-12-31	15087
2010-03-31	11695
2010-06-30	11980
2010-09-30	13382
2010-12-31	13144
2011-03-31	13677
2011-06-30	12626
2011-09-30	11708
2011-12-31	10939
2012-03-31	8911
2012-06-30	7837
2012-09-30	7262
2012-12-31	7526
2013-03-31	11723
2013-06-30	11870
2013-09-30	13020
2013-12-31	15941
2014-03-31	16511
2014-06-30	14714
2014-09-30	14922
2014-12-31	13364
2015-03-31	4512
2015-06-30	4914
2015-09-30	4999
2015-12-31	5447
2016-03-31	5534
2016-06-30	4652
2016-09-30	6179
2016-12-31	5901
2017-03-31	6345
2017-06-30	5490
2017-09-30	6241
2017-12-31	6635
2018-03-31	9027
2018-06-30	9872
2018-09-30	10306
2018-12-31	11326
2019-03-31	9615
2019-06-30	8944
2019-09-30	7512
2019-12-31	7672
2020-03-31	8465
2020-06-30	4277
2020-09-30	3955
2020-12-31	5395
2021-03-31	4426
2021-06-30	4213
2021-09-30	4533
2021-12-31	3925
2022-03-31	3966
2022-06-30	2522
2022-09-30	2547
2022-12-31	2047
2023-03-31	1818
2023-06-30	1209
2023-09-30	1658