Quarter	US dollars
1999-03-31	28
1999-06-30	27
1999-09-30	27
1999-12-31	0
2000-03-31	0
2000-06-30	0
2000-09-30	0
2000-12-31	0
2001-03-31	0
2001-06-30	0
2001-09-30	0
2001-12-31	0
2002-03-31	4
2002-06-30	4
2002-09-30	2
2002-12-31	2
2003-03-31	0
2003-06-30	1
2003-09-30	0
2003-12-31	0
2004-03-31	0
2004-06-30	0
2004-09-30	0
2004-12-31	0
2005-03-31	0
2005-06-30	0
2005-09-30	0
2005-12-31	0
2006-03-31	0
2006-06-30	0
2006-09-30	0
2006-12-31	0
2007-03-31	0
2007-06-30	0
2007-09-30	0
2007-12-31	0
2008-03-31	0
2008-06-30	0
2008-09-30	0
2008-12-31	0
2009-03-31	0
2009-06-30	0
2009-09-30	0
2009-12-31	0
2010-03-31	0
2010-06-30	0
2010-09-30	0
2010-12-31	0
2011-03-31	0
2011-06-30	0
2011-09-30	0
2011-12-31	0
2012-03-31	0
2012-06-30	0
2012-09-30	0
2012-12-31	0
2013-03-31	0
2013-06-30	0
2013-09-30	0
2013-12-31	0
2014-03-31	0
2014-06-30	0
2014-09-30	0
2014-12-31	0
2015-03-31	2
2015-06-30	3
2015-09-30	6
2015-12-31	7
2016-03-31	8
2016-06-30	19
2016-09-30	26
2016-12-31	36
2017-03-31	36
2017-06-30	44
2017-09-30	44
2017-12-31	53
2018-03-31	57
2018-06-30	60
2018-09-30	58
2018-12-31	58
2019-03-31	53
2019-06-30	53
2019-09-30	47
2019-12-31	47
2020-03-31	45
2020-06-30	46
2020-09-30	40
2020-12-31	40
2021-03-31	34
2021-06-30	34
2021-09-30	28
2021-12-31	28
2022-03-31	23
2022-06-30	23
2022-09-30	17
2022-12-31	17
2023-03-31	11
2023-06-30	11
2023-09-30	6