Quarter	US dollars
1999-03-31	11
1999-06-30	1
1999-09-30	1
1999-12-31	26
2000-03-31	2
2000-06-30	2
2000-09-30	2
2000-12-31	2
2001-03-31	6
2001-06-30	4
2001-09-30	4
2001-12-31	3
2002-03-31	3
2002-06-30	3
2002-09-30	6
2002-12-31	5
2003-03-31	3
2003-06-30	7
2003-09-30	7
2003-12-31	3
2004-03-31	2
2004-06-30	1
2004-09-30	5
2004-12-31	7
2005-03-31	6
2005-06-30	22
2005-09-30	14
2005-12-31	7
2006-03-31	9
2006-06-30	7
2006-09-30	5
2006-12-31	12
2007-03-31	44
2007-06-30	17
2007-09-30	19
2007-12-31	14
2008-03-31	25
2008-06-30	27
2008-09-30	27
2008-12-31	24
2009-03-31	19
2009-06-30	15
2009-09-30	11
2009-12-31	16
2010-03-31	71
2010-06-30	75
2010-09-30	94
2010-12-31	66
2011-03-31	54
2011-06-30	63
2011-09-30	62
2011-12-31	59
2012-03-31	49
2012-06-30	46
2012-09-30	34
2012-12-31	46
2013-03-31	80
2013-06-30	81
2013-09-30	57
2013-12-31	60
2014-03-31	60
2014-06-30	75
2014-09-30	75
2014-12-31	88
2015-03-31	85
2015-06-30	79
2015-09-30	68
2015-12-31	45
2016-03-31	45
2016-06-30	46
2016-09-30	94
2016-12-31	91
2017-03-31	100
2017-06-30	143
2017-09-30	123
2017-12-31	92
2018-03-31	120
2018-06-30	125
2018-09-30	117
2018-12-31	114
2019-03-31	156
2019-06-30	160
2019-09-30	157
2019-12-31	164
2020-03-31	137
2020-06-30	103
2020-09-30	83
2020-12-31	99
2021-03-31	93
2021-06-30	136
2021-09-30	127
2021-12-31	123
2022-03-31	134
2022-06-30	171
2022-09-30	120
2022-12-31	85
2023-03-31	103
2023-06-30	111
2023-09-30	84