Quarter	US dollars
1999-03-31	9
1999-06-30	12
1999-09-30	16
1999-12-31	14
2000-03-31	15
2000-06-30	10
2000-09-30	5
2000-12-31	5
2001-03-31	11
2001-06-30	11
2001-09-30	16
2001-12-31	30
2002-03-31	30
2002-06-30	19
2002-09-30	21
2002-12-31	33
2003-03-31	32
2003-06-30	10
2003-09-30	11
2003-12-31	12
2004-03-31	12
2004-06-30	18
2004-09-30	9
2004-12-31	9
2005-03-31	12
2005-06-30	0
2005-09-30	4
2005-12-31	7
2006-03-31	12
2006-06-30	1
2006-09-30	1
2006-12-31	2
2007-03-31	5
2007-06-30	8
2007-09-30	9
2007-12-31	10
2008-03-31	14
2008-06-30	26
2008-09-30	29
2008-12-31	13
2009-03-31	12
2009-06-30	12
2009-09-30	3
2009-12-31	4
2010-03-31	22
2010-06-30	10
2010-09-30	182
2010-12-31	33
2011-03-31	57
2011-06-30	62
2011-09-30	387
2011-12-31	77
2012-03-31	74
2012-06-30	30
2012-09-30	26
2012-12-31	1
2013-03-31	1
2013-06-30	2
2013-09-30	2
2013-12-31	2
2014-03-31	2
2014-06-30	3
2014-09-30	3
2014-12-31	4
2015-03-31	4
2015-06-30	7
2015-09-30	3
2015-12-31	5
2016-03-31	6
2016-06-30	9
2016-09-30	6
2016-12-31	4
2017-03-31	5
2017-06-30	5
2017-09-30	6
2017-12-31	6
2018-03-31	4
2018-06-30	3
2018-09-30	3
2018-12-31	2
2019-03-31	3
2019-06-30	4
2019-09-30	2
2019-12-31	4
2020-03-31	3
2020-06-30	2
2020-09-30	4
2020-12-31	4
2021-03-31	2
2021-06-30	2
2021-09-30	2
2021-12-31	1
2022-03-31	3
2022-06-30	3
2022-09-30	3
2022-12-31	2
2023-03-31	2
2023-06-30	3
2023-09-30	2