Quarter	US dollars
1999-03-31	10
1999-06-30	11
1999-09-30	7
1999-12-31	8
2000-03-31	2
2000-06-30	5
2000-09-30	2
2000-12-31	8
2001-03-31	8
2001-06-30	10
2001-09-30	6
2001-12-31	8
2002-03-31	10
2002-06-30	12
2002-09-30	27
2002-12-31	20
2003-03-31	20
2003-06-30	20
2003-09-30	16
2003-12-31	29
2004-03-31	34
2004-06-30	42
2004-09-30	65
2004-12-31	75
2005-03-31	78
2005-06-30	52
2005-09-30	81
2005-12-31	111
2006-03-31	95
2006-06-30	60
2006-09-30	115
2006-12-31	111
2007-03-31	132
2007-06-30	87
2007-09-30	105
2007-12-31	98
2008-03-31	85
2008-06-30	95
2008-09-30	93
2008-12-31	83
2009-03-31	69
2009-06-30	75
2009-09-30	72
2009-12-31	74
2010-03-31	72
2010-06-30	71
2010-09-30	80
2010-12-31	75
2011-03-31	87
2011-06-30	94
2011-09-30	71
2011-12-31	58
2012-03-31	70
2012-06-30	59
2012-09-30	63
2012-12-31	60
2013-03-31	44
2013-06-30	40
2013-09-30	38
2013-12-31	33
2014-03-31	24
2014-06-30	28
2014-09-30	25
2014-12-31	22
2015-03-31	18
2015-06-30	19
2015-09-30	43
2015-12-31	75
2016-03-31	77
2016-06-30	12
2016-09-30	10
2016-12-31	6
2017-03-31	10
2017-06-30	13
2017-09-30	16
2017-12-31	12
2018-03-31	14
2018-06-30	11
2018-09-30	13
2018-12-31	13
2019-03-31	18
2019-06-30	17
2019-09-30	17
2019-12-31	15
2020-03-31	14
2020-06-30	14
2020-09-30	27
2020-12-31	31
2021-03-31	32
2021-06-30	35
2021-09-30	37
2021-12-31	43
2022-03-31	42
2022-06-30	40
2022-09-30	32
2022-12-31	35
2023-03-31	37
2023-06-30	39
2023-09-30	38