Quarter	US dollars
1999-03-31	26
1999-06-30	25
1999-09-30	25
1999-12-31	25
2000-03-31	51
2000-06-30	40
2000-09-30	35
2000-12-31	41
2001-03-31	39
2001-06-30	35
2001-09-30	34
2001-12-31	25
2002-03-31	20
2002-06-30	21
2002-09-30	25
2002-12-31	28
2003-03-31	25
2003-06-30	19
2003-09-30	13
2003-12-31	12
2004-03-31	0
2004-06-30	1
2004-09-30	1
2004-12-31	1
2005-03-31	1
2005-06-30	1
2005-09-30	3
2005-12-31	3
2006-03-31	5
2006-06-30	5
2006-09-30	5
2006-12-31	10
2007-03-31	2
2007-06-30	4
2007-09-30	5
2007-12-31	41
2008-03-31	4
2008-06-30	4
2008-09-30	4
2008-12-31	2
2009-03-31	1
2009-06-30	2
2009-09-30	2
2009-12-31	7
2010-03-31	8
2010-06-30	8
2010-09-30	23
2010-12-31	12
2011-03-31	12
2011-06-30	14
2011-09-30	12
2011-12-31	14
2012-03-31	5
2012-06-30	3
2012-09-30	5
2012-12-31	7
2013-03-31	10
2013-06-30	10
2013-09-30	7
2013-12-31	10
2014-03-31	3
2014-06-30	5
2014-09-30	6
2014-12-31	5
2015-03-31	3
2015-06-30	51
2015-09-30	54
2015-12-31	82
2016-03-31	83
2016-06-30	77
2016-09-30	93
2016-12-31	78
2017-03-31	82
2017-06-30	81
2017-09-30	75
2017-12-31	92
2018-03-31	71
2018-06-30	63
2018-09-30	66
2018-12-31	58
2019-03-31	76
2019-06-30	53
2019-09-30	64
2019-12-31	74
2020-03-31	49
2020-06-30	25
2020-09-30	23
2020-12-31	22
2021-03-31	52
2021-06-30	51
2021-09-30	82
2021-12-31	80
2022-03-31	85
2022-06-30	46
2022-09-30	55
2022-12-31	84
2023-03-31	76
2023-06-30	84
2023-09-30	89