Quarter	US dollars
1999-03-31	6
1999-06-30	10
1999-09-30	13
1999-12-31	11
2000-03-31	10
2000-06-30	24
2000-09-30	5
2000-12-31	5
2001-03-31	5
2001-06-30	7
2001-09-30	4
2001-12-31	4
2002-03-31	5
2002-06-30	7
2002-09-30	2
2002-12-31	2
2003-03-31	1
2003-06-30	1
2003-09-30	0
2003-12-31	0
2004-03-31	0
2004-06-30	0
2004-09-30	0
2004-12-31	0
2005-03-31	0
2005-06-30	0
2005-09-30	0
2005-12-31	0
2006-03-31	0
2006-06-30	12
2006-09-30	2
2006-12-31	10
2007-03-31	1
2007-06-30	32
2007-09-30	108
2007-12-31	65
2008-03-31	65
2008-06-30	65
2008-09-30	63
2008-12-31	55
2009-03-31	51
2009-06-30	69
2009-09-30	51
2009-12-31	45
2010-03-31	43
2010-06-30	47
2010-09-30	49
2010-12-31	45
2011-03-31	88
2011-06-30	88
2011-09-30	89
2011-12-31	97
2012-03-31	100
2012-06-30	56
2012-09-30	42
2012-12-31	25
2013-03-31	79
2013-06-30	84
2013-09-30	87
2013-12-31	14
2014-03-31	82
2014-06-30	79
2014-09-30	79
2014-12-31	83
2015-03-31	72
2015-06-30	68
2015-09-30	66
2015-12-31	76
2016-03-31	66
2016-06-30	66
2016-09-30	73
2016-12-31	84
2017-03-31	90
2017-06-30	121
2017-09-30	117
2017-12-31	64
2018-03-31	72
2018-06-30	74
2018-09-30	129
2018-12-31	98
2019-03-31	104
2019-06-30	80
2019-09-30	126
2019-12-31	148
2020-03-31	143
2020-06-30	142
2020-09-30	141
2020-12-31	168
2021-03-31	144
2021-06-30	145
2021-09-30	139
2021-12-31	139
2022-03-31	138
2022-06-30	122
2022-09-30	125
2022-12-31	102
2023-03-31	107
2023-06-30	116
2023-09-30	25