Quarter	US dollars
1999-09-30	0
1999-12-31	2
2000-03-31	2
2000-06-30	2
2000-09-30	3
2000-12-31	1
2001-03-31	6
2001-06-30	3
2001-09-30	1
2001-12-31	4
2002-03-31	3
2002-06-30	8
2002-09-30	2
2002-12-31	2
2003-03-31	3
2003-06-30	2
2003-09-30	8
2003-12-31	7
2004-03-31	11
2004-06-30	2
2004-09-30	5
2004-12-31	6
2005-03-31	60
2005-06-30	5
2005-09-30	7
2005-12-31	15
2006-03-31	28
2006-06-30	43
2006-09-30	50
2006-12-31	68
2007-03-31	69
2007-06-30	50
2007-09-30	53
2007-12-31	42
2008-03-31	72
2008-06-30	62
2008-09-30	30
2008-12-31	27
2009-03-31	32
2009-06-30	28
2009-09-30	43
2009-12-31	39
2010-03-31	49
2010-06-30	40
2010-09-30	47
2010-12-31	89
2011-03-31	96
2011-06-30	50
2011-09-30	25
2011-12-31	8
2012-03-31	8
2012-06-30	9
2012-09-30	16
2012-12-31	18
2013-03-31	23
2013-06-30	14
2013-09-30	19
2013-12-31	17
2014-03-31	22
2014-06-30	27
2014-09-30	26
2014-12-31	45
2015-03-31	55
2015-06-30	30
2015-09-30	45
2015-12-31	36
2016-03-31	60
2016-06-30	64
2016-09-30	64
2016-12-31	37
2017-03-31	39
2017-06-30	44
2017-09-30	40
2017-12-31	50
2018-03-31	32
2018-06-30	29
2018-09-30	25
2018-12-31	33
2019-03-31	39
2019-06-30	55
2019-09-30	60
2019-12-31	50
2020-03-31	58
2020-06-30	66
2020-09-30	80
2020-12-31	83
2021-03-31	55
2021-06-30	47
2021-09-30	46
2021-12-31	34
2022-03-31	16
2022-06-30	6
2022-09-30	4
2022-12-31	4
2023-03-31	3
2023-06-30	0
2023-09-30	0