Quarter	US dollars
1999-03-31	949
1999-06-30	1247
1999-09-30	1494
1999-12-31	1991
2000-03-31	2611
2000-06-30	3299
2000-09-30	4526
2000-12-31	5345
2001-03-31	5441
2001-06-30	5906
2001-09-30	5935
2001-12-31	5121
2002-03-31	2944
2002-06-30	2611
2002-09-30	2596
2002-12-31	2939
2003-03-31	3375
2003-06-30	3065
2003-09-30	3200
2003-12-31	3174
2004-03-31	3084
2004-06-30	3043
2004-09-30	3203
2004-12-31	2789
2005-03-31	2864
2005-06-30	2860
2005-09-30	2662
2005-12-31	2646
2006-03-31	3741
2006-06-30	4091
2006-09-30	4376
2006-12-31	3856
2007-03-31	2866
2007-06-30	2759
2007-09-30	2681
2007-12-31	2782
2008-03-31	2663
2008-06-30	2184
2008-09-30	2100
2008-12-31	1561
2009-03-31	1483
2009-06-30	1555
2009-09-30	1536
2009-12-31	1492
2010-03-31	1124
2010-06-30	981
2010-09-30	456
2010-12-31	446
2011-03-31	448
2011-06-30	401
2011-09-30	263
2011-12-31	173
2012-03-31	86
2012-06-30	84
2012-09-30	69
2012-12-31	67
2013-03-31	67
2013-06-30	7
2013-09-30	7
2013-12-31	7
2014-03-31	7
2014-06-30	7
2014-09-30	7
2014-12-31	7
2015-03-31	7
2015-06-30	7
2015-09-30	11
2015-12-31	7
2016-03-31	7
2016-06-30	7
2016-09-30	9
2016-12-31	14
2017-03-31	14
2017-06-30	12
2017-09-30	12
2017-12-31	7
2018-03-31	7
2018-06-30	7
2018-09-30	7
2018-12-31	7
2019-03-31	7
2019-06-30	7
2019-09-30	7
2019-12-31	7
2020-03-31	7
2020-06-30	7
2020-09-30	8
2020-12-31	8
2021-03-31	7
2021-06-30	7
2021-09-30	7
2021-12-31	7
2022-03-31	8
2022-06-30	7
2022-09-30	7
2022-12-31	7
2023-03-31	7
2023-06-30	7
2023-09-30	7