Quarter	US dollars
1999-03-31	36
1999-06-30	9
1999-09-30	10
1999-12-31	10
2000-03-31	9
2000-06-30	13
2000-09-30	9
2000-12-31	8
2001-03-31	10
2001-06-30	10
2001-09-30	11
2001-12-31	11
2002-03-31	10
2002-06-30	11
2002-09-30	13
2002-12-31	17
2003-03-31	17
2003-06-30	16
2003-09-30	15
2003-12-31	15
2004-03-31	23
2004-06-30	22
2004-09-30	31
2004-12-31	29
2005-03-31	15
2005-06-30	12
2005-09-30	54
2005-12-31	32
2006-03-31	94
2006-06-30	91
2006-09-30	119
2006-12-31	88
2007-03-31	71
2007-06-30	54
2007-09-30	60
2007-12-31	48
2008-03-31	39
2008-06-30	36
2008-09-30	30
2008-12-31	26
2009-03-31	19
2009-06-30	26
2009-09-30	23
2009-12-31	27
2010-03-31	25
2010-06-30	23
2010-09-30	29
2010-12-31	27
2011-03-31	40
2011-06-30	36
2011-09-30	25
2011-12-31	35
2012-03-31	25
2012-06-30	8
2012-09-30	18
2012-12-31	7
2013-03-31	5
2013-06-30	2
2013-09-30	2
2013-12-31	2
2014-03-31	2
2014-06-30	2
2014-09-30	2
2014-12-31	2
2015-03-31	2
2015-06-30	2
2015-09-30	2
2015-12-31	2
2016-03-31	2
2016-06-30	2
2016-09-30	2
2016-12-31	2
2017-03-31	2
2017-06-30	2
2017-09-30	2
2017-12-31	2
2018-03-31	2
2018-06-30	2
2018-09-30	2
2018-12-31	2
2019-03-31	2
2019-06-30	2
2019-09-30	5
2019-12-31	2
2020-03-31	13
2020-06-30	12
2020-09-30	2
2020-12-31	2
2021-03-31	2
2021-06-30	0
2021-09-30	0
2021-12-31	0
2022-03-31	0
2022-06-30	0
2022-09-30	0
2022-12-31	0
2023-03-31	0
2023-06-30	0
2023-09-30	0