Quarter	US dollars
1999-03-31	13
1999-06-30	15
1999-09-30	15
1999-12-31	15
2000-03-31	18
2000-06-30	22
2000-09-30	21
2000-12-31	18
2001-03-31	9
2001-06-30	9
2001-09-30	12
2001-12-31	14
2002-03-31	54
2002-06-30	58
2002-09-30	57
2002-12-31	76
2003-03-31	82
2003-06-30	71
2003-09-30	50
2003-12-31	67
2004-03-31	47
2004-06-30	66
2004-09-30	93
2004-12-31	118
2005-03-31	128
2005-06-30	144
2005-09-30	178
2005-12-31	171
2006-03-31	209
2006-06-30	219
2006-09-30	202
2006-12-31	164
2007-03-31	168
2007-06-30	85
2007-09-30	58
2007-12-31	30
2008-03-31	131
2008-06-30	78
2008-09-30	91
2008-12-31	84
2009-03-31	40
2009-06-30	49
2009-09-30	48
2009-12-31	36
2010-03-31	98
2010-06-30	93
2010-09-30	102
2010-12-31	111
2011-03-31	134
2011-06-30	128
2011-09-30	128
2011-12-31	145
2012-03-31	110
2012-06-30	100
2012-09-30	104
2012-12-31	126
2013-03-31	112
2013-06-30	87
2013-09-30	91
2013-12-31	75
2014-03-31	73
2014-06-30	85
2014-09-30	79
2014-12-31	82
2015-03-31	136
2015-06-30	145
2015-09-30	121
2015-12-31	58
2016-03-31	72
2016-06-30	51
2016-09-30	41
2016-12-31	30
2017-03-31	35
2017-06-30	34
2017-09-30	39
2017-12-31	48
2018-03-31	37
2018-06-30	52
2018-09-30	62
2018-12-31	74
2019-03-31	57
2019-06-30	66
2019-09-30	50
2019-12-31	47
2020-03-31	53
2020-06-30	95
2020-09-30	92
2020-12-31	165
2021-03-31	379
2021-06-30	127
2021-09-30	463
2021-12-31	214
2022-03-31	97
2022-06-30	384
2022-09-30	133
2022-12-31	106
2023-03-31	325
2023-06-30	367
2023-09-30	158