Quarter	US dollars
1999-03-31	6
1999-06-30	8
1999-09-30	10
1999-12-31	5
2000-03-31	5
2000-06-30	5
2000-09-30	13
2000-12-31	4
2001-03-31	9
2001-06-30	15
2001-09-30	18
2001-12-31	30
2002-03-31	35
2002-06-30	5
2002-09-30	6
2002-12-31	5
2003-03-31	12
2003-06-30	6
2003-09-30	7
2003-12-31	8
2004-03-31	8
2004-06-30	7
2004-09-30	7
2004-12-31	9
2005-03-31	9
2005-06-30	6
2005-09-30	8
2005-12-31	8
2006-03-31	8
2006-06-30	9
2006-09-30	8
2006-12-31	8
2007-03-31	15
2007-06-30	16
2007-09-30	15
2007-12-31	60
2008-03-31	20
2008-06-30	26
2008-09-30	12
2008-12-31	11
2009-03-31	12
2009-06-30	10
2009-09-30	20
2009-12-31	9
2010-03-31	11
2010-06-30	9
2010-09-30	10
2010-12-31	5
2011-03-31	6
2011-06-30	6
2011-09-30	5
2011-12-31	4
2012-03-31	4
2012-06-30	7
2012-09-30	8
2012-12-31	158
2013-03-31	95
2013-06-30	403
2013-09-30	568
2013-12-31	756
2014-03-31	962
2014-06-30	940
2014-09-30	565
2014-12-31	98
2015-03-31	12
2015-06-30	25
2015-09-30	1113
2015-12-31	1091
2016-03-31	1209
2016-06-30	1365
2016-09-30	811
2016-12-31	851
2017-03-31	1086
2017-06-30	1178
2017-09-30	965
2017-12-31	1001
2018-03-31	975
2018-06-30	632
2018-09-30	829
2018-12-31	1019
2019-03-31	1362
2019-06-30	1843
2019-09-30	2717
2019-12-31	1673
2020-03-31	2820
2020-06-30	3270
2020-09-30	3525
2020-12-31	3546
2021-03-31	571
2021-06-30	604
2021-09-30	687
2021-12-31	643
2022-03-31	379
2022-06-30	794
2022-09-30	1118
2022-12-31	888
2023-03-31	544
2023-06-30	673
2023-09-30	629