Quarter	US dollars
1999-03-31	84
1999-06-30	41
1999-09-30	58
1999-12-31	19
2000-03-31	11
2000-06-30	4
2000-09-30	3
2000-12-31	1
2001-03-31	1
2001-06-30	1
2001-09-30	1
2001-12-31	1
2002-03-31	1
2002-06-30	1
2002-09-30	1
2002-12-31	1
2003-03-31	3
2003-06-30	1
2003-09-30	1
2003-12-31	1
2004-03-31	1
2004-06-30	2
2004-09-30	68
2004-12-31	55
2005-03-31	57
2005-06-30	61
2005-09-30	63
2005-12-31	67
2006-03-31	79
2006-06-30	81
2006-09-30	78
2006-12-31	83
2007-03-31	7
2007-06-30	8
2007-09-30	15
2007-12-31	8
2008-03-31	13
2008-06-30	19
2008-09-30	11
2008-12-31	16
2009-03-31	12
2009-06-30	9
2009-09-30	12
2009-12-31	6
2010-03-31	5
2010-06-30	11
2010-09-30	12
2010-12-31	117
2011-03-31	114
2011-06-30	121
2011-09-30	205
2011-12-31	170
2012-03-31	222
2012-06-30	170
2012-09-30	23
2012-12-31	33
2013-03-31	33
2013-06-30	33
2013-09-30	17
2013-12-31	14
2014-03-31	19
2014-06-30	21
2014-09-30	7
2014-12-31	23
2015-03-31	23
2015-06-30	38
2015-09-30	27
2015-12-31	43
2016-03-31	42
2016-06-30	67
2016-09-30	65
2016-12-31	56
2017-03-31	59
2017-06-30	64
2017-09-30	62
2017-12-31	59
2018-03-31	64
2018-06-30	57
2018-09-30	54
2018-12-31	58
2019-03-31	63
2019-06-30	68
2019-09-30	69
2019-12-31	69
2020-03-31	1
2020-06-30	1
2020-09-30	7
2020-12-31	1
2021-03-31	8
2021-06-30	8
2021-09-30	1
2021-12-31	1
2022-03-31	1
2022-06-30	4
2022-09-30	4
2022-12-31	4
2023-03-31	3
2023-06-30	3
2023-09-30	4