Quarter	US dollars
1999-03-31	36
1999-06-30	72
1999-09-30	56
1999-12-31	47
2000-03-31	32
2000-06-30	29
2000-09-30	22
2000-12-31	16
2001-03-31	12
2001-06-30	9
2001-09-30	12
2001-12-31	27
2002-03-31	29
2002-06-30	26
2002-09-30	48
2002-12-31	53
2003-03-31	44
2003-06-30	59
2003-09-30	46
2003-12-31	23
2004-03-31	44
2004-06-30	39
2004-09-30	53
2004-12-31	41
2005-03-31	39
2005-06-30	38
2005-09-30	35
2005-12-31	36
2006-03-31	37
2006-06-30	36
2006-09-30	14
2006-12-31	34
2007-03-31	18
2007-06-30	36
2007-09-30	131
2007-12-31	48
2008-03-31	42
2008-06-30	79
2008-09-30	38
2008-12-31	38
2009-03-31	37
2009-06-30	39
2009-09-30	40
2009-12-31	45
2010-03-31	44
2010-06-30	48
2010-09-30	50
2010-12-31	40
2011-03-31	27
2011-06-30	12
2011-09-30	85
2011-12-31	28
2012-03-31	123
2012-06-30	1
2012-09-30	54
2012-12-31	9
2013-03-31	6
2013-06-30	8
2013-09-30	6
2013-12-31	6
2014-03-31	7
2014-06-30	10
2014-09-30	7
2014-12-31	6
2015-03-31	5
2015-06-30	5
2015-09-30	5
2015-12-31	6
2016-03-31	-20
2016-06-30	-21
2016-09-30	-21
2016-12-31	-20
2017-03-31	-20
2017-06-30	-21
2017-09-30	46
2017-12-31	-4
2018-03-31	-23
2018-06-30	1
2018-09-30	1
2018-12-31	4
2019-03-31	4
2019-06-30	49
2019-09-30	2
2019-12-31	20
2020-03-31	1
2020-06-30	1
2020-09-30	0
2020-12-31	0
2021-03-31	1
2021-06-30	0
2021-09-30	1
2021-12-31	0
2022-03-31	1
2022-06-30	2
2022-09-30	45
2022-12-31	1
2023-03-31	0
2023-06-30	4
2023-09-30	5