Quarter	US dollars
1999-03-31	349
1999-06-30	17
1999-09-30	16
1999-12-31	15
2000-03-31	25
2000-06-30	34
2000-09-30	32
2000-12-31	63
2001-03-31	29
2001-06-30	30
2001-09-30	20
2001-12-31	14
2002-03-31	18
2002-06-30	63
2002-09-30	12
2002-12-31	13
2003-03-31	11
2003-06-30	10
2003-09-30	11
2003-12-31	11
2004-03-31	10
2004-06-30	10
2004-09-30	13
2004-12-31	21
2005-03-31	31
2005-06-30	35
2005-09-30	29
2005-12-31	27
2006-03-31	21
2006-06-30	46
2006-09-30	35
2006-12-31	42
2007-03-31	18
2007-06-30	21
2007-09-30	33
2007-12-31	23
2008-03-31	30
2008-06-30	23
2008-09-30	14
2008-12-31	16
2009-03-31	30
2009-06-30	14
2009-09-30	20
2009-12-31	28
2010-03-31	21
2010-06-30	17
2010-09-30	26
2010-12-31	42
2011-03-31	78
2011-06-30	58
2011-09-30	166
2011-12-31	190
2012-03-31	74
2012-06-30	83
2012-09-30	31
2012-12-31	94
2013-03-31	104
2013-06-30	91
2013-09-30	98
2013-12-31	107
2014-03-31	75
2014-06-30	100
2014-09-30	81
2014-12-31	59
2015-03-31	87
2015-06-30	87
2015-09-30	96
2015-12-31	111
2016-03-31	127
2016-06-30	144
2016-09-30	148
2016-12-31	115
2017-03-31	129
2017-06-30	128
2017-09-30	143
2017-12-31	125
2018-03-31	139
2018-06-30	149
2018-09-30	130
2018-12-31	118
2019-03-31	94
2019-06-30	135
2019-09-30	124
2019-12-31	184
2020-03-31	178
2020-06-30	174
2020-09-30	148
2020-12-31	164
2021-03-31	131
2021-06-30	107
2021-09-30	93
2021-12-31	117
2022-03-31	91
2022-06-30	99
2022-09-30	105
2022-12-31	127
2023-03-31	105
2023-06-30	101
2023-09-30	106