Quarter	US dollars
1999-03-31	0
1999-06-30	0
1999-09-30	0
1999-12-31	2
2000-03-31	0
2000-06-30	1
2000-09-30	0
2000-12-31	1
2001-03-31	1
2001-06-30	1
2001-09-30	1
2001-12-31	0
2002-03-31	1
2002-06-30	1
2002-09-30	4
2002-12-31	2
2003-03-31	6
2003-06-30	6
2003-09-30	6
2003-12-31	5
2004-03-31	4
2004-06-30	23
2004-09-30	23
2004-12-31	24
2005-03-31	37
2005-06-30	3
2005-09-30	4
2005-12-31	3
2006-03-31	18
2006-06-30	5
2006-09-30	9
2006-12-31	23
2007-03-31	30
2007-06-30	17
2007-09-30	22
2007-12-31	18
2008-03-31	3
2008-06-30	6
2008-09-30	19
2008-12-31	14
2009-03-31	10
2009-06-30	0
2009-09-30	1
2009-12-31	0
2010-03-31	1
2010-06-30	0
2010-09-30	0
2010-12-31	0
2011-03-31	4
2011-06-30	2
2011-09-30	2
2011-12-31	1
2012-03-31	3
2012-06-30	3
2012-09-30	5
2012-12-31	4
2013-03-31	218
2013-06-30	189
2013-09-30	183
2013-12-31	19
2014-03-31	198
2014-06-30	188
2014-09-30	188
2014-12-31	189
2015-03-31	182
2015-06-30	183
2015-09-30	193
2015-12-31	203
2016-03-31	20
2016-06-30	3
2016-09-30	8
2016-12-31	5
2017-03-31	11
2017-06-30	12
2017-09-30	4
2017-12-31	10
2018-03-31	20
2018-06-30	30
2018-09-30	26
2018-12-31	33
2019-03-31	52
2019-06-30	65
2019-09-30	96
2019-12-31	95
2020-03-31	75
2020-06-30	66
2020-09-30	79
2020-12-31	46
2021-03-31	65
2021-06-30	98
2021-09-30	51
2021-12-31	124
2022-03-31	118
2022-06-30	106
2022-09-30	100
2022-12-31	46
2023-03-31	57
2023-06-30	112
2023-09-30	224