Quarter	US dollars
1999-09-30	0
1999-12-31	0
2000-03-31	0
2000-06-30	0
2000-09-30	0
2000-12-31	1
2001-03-31	0
2001-06-30	0
2001-09-30	3
2001-12-31	3
2002-03-31	1
2002-06-30	9
2002-09-30	19
2002-12-31	21
2003-03-31	22
2003-06-30	25
2003-09-30	22
2003-12-31	16
2004-03-31	22
2004-06-30	15
2004-09-30	24
2004-12-31	21
2005-03-31	26
2005-06-30	38
2005-09-30	25
2005-12-31	21
2006-03-31	5
2006-06-30	11
2006-09-30	19
2006-12-31	10
2007-03-31	14
2007-06-30	12
2007-09-30	22
2007-12-31	92
2008-03-31	101
2008-06-30	64
2008-09-30	71
2008-12-31	217
2009-03-31	188
2009-06-30	133
2009-09-30	152
2009-12-31	123
2010-03-31	133
2010-06-30	159
2010-09-30	159
2010-12-31	136
2011-03-31	122
2011-06-30	112
2011-09-30	134
2011-12-31	118
2012-03-31	115
2012-06-30	141
2012-09-30	153
2012-12-31	123
2013-03-31	112
2013-06-30	77
2013-09-30	73
2013-12-31	68
2014-03-31	83
2014-06-30	75
2014-09-30	68
2014-12-31	76
2015-03-31	89
2015-06-30	57
2015-09-30	62
2015-12-31	50
2016-03-31	58
2016-06-30	68
2016-09-30	52
2016-12-31	28
2017-03-31	35
2017-06-30	36
2017-09-30	32
2017-12-31	32
2018-03-31	35
2018-06-30	29
2018-09-30	29
2018-12-31	22
2019-03-31	17
2019-06-30	18
2019-09-30	15
2019-12-31	13
2020-03-31	31
2020-06-30	28
2020-09-30	26
2020-12-31	31
2021-03-31	36
2021-06-30	15
2021-09-30	15
2021-12-31	18
2022-03-31	7
2022-06-30	6
2022-09-30	4
2022-12-31	9
2023-03-31	5
2023-06-30	3
2023-09-30	5