Quarter	US dollars
1999-03-31	5990
1999-06-30	6244
1999-09-30	6879
1999-12-31	6879
2000-03-31	6845
2000-06-30	6898
2000-09-30	6354
2000-12-31	7039
2001-03-31	8000
2001-06-30	7324
2001-09-30	7539
2001-12-31	6931
2002-03-31	6167
2002-06-30	5918
2002-09-30	5112
2002-12-31	4766
2003-03-31	4335
2003-06-30	4037
2003-09-30	4036
2003-12-31	3667
2004-03-31	3635
2004-06-30	2884
2004-09-30	3698
2004-12-31	3380
2005-03-31	3309
2005-06-30	3985
2005-09-30	3591
2005-12-31	4068
2006-03-31	6034
2006-06-30	5675
2006-09-30	6936
2006-12-31	7423
2007-03-31	9822
2007-06-30	12207
2007-09-30	10675
2007-12-31	10946
2008-03-31	12592
2008-06-30	12129
2008-09-30	13828
2008-12-31	7003
2009-03-31	8120
2009-06-30	7657
2009-09-30	5957
2009-12-31	6356
2010-03-31	7676
2010-06-30	7573
2010-09-30	12979
2010-12-31	14124
2011-03-31	15108
2011-06-30	15904
2011-09-30	12769
2011-12-31	13176
2012-03-31	14889
2012-06-30	12929
2012-09-30	12687
2012-12-31	11415
2013-03-31	12995
2013-06-30	15719
2013-09-30	12637
2013-12-31	12882
2014-03-31	12294
2014-06-30	12552
2014-09-30	10498
2014-12-31	11228
2015-03-31	10802
2015-06-30	12598
2015-09-30	11855
2015-12-31	10545
2016-03-31	11276
2016-06-30	10748
2016-09-30	9871
2016-12-31	7576
2017-03-31	7564
2017-06-30	6798
2017-09-30	7886
2017-12-31	7442
2018-03-31	6999
2018-06-30	6839
2018-09-30	9489
2018-12-31	9864
2019-03-31	9997
2019-06-30	8072
2019-09-30	11231
2019-12-31	9611
2020-03-31	11009
2020-06-30	7949
2020-09-30	6750
2020-12-31	10293
2021-03-31	10932
2021-06-30	10219
2021-09-30	10442
2021-12-31	25164
2022-03-31	20019
2022-06-30	9657
2022-09-30	24191
2022-12-31	24870
2023-03-31	25767
2023-06-30	26465
2023-09-30	9229