Quarter	US dollars
1999-03-31	7
1999-06-30	6
1999-09-30	13
1999-12-31	15
2000-03-31	8
2000-06-30	8
2000-09-30	15
2000-12-31	11
2001-03-31	5
2001-06-30	8
2001-09-30	20
2001-12-31	83
2002-03-31	12
2002-06-30	24
2002-09-30	44
2002-12-31	26
2003-03-31	21
2003-06-30	9
2003-09-30	22
2003-12-31	64
2004-03-31	76
2004-06-30	20
2004-09-30	18
2004-12-31	72
2005-03-31	24
2005-06-30	30
2005-09-30	30
2005-12-31	7
2006-03-31	10
2006-06-30	14
2006-09-30	26
2006-12-31	3
2007-03-31	13
2007-06-30	3
2007-09-30	9
2007-12-31	19
2008-03-31	5
2008-06-30	8
2008-09-30	6
2008-12-31	9
2009-03-31	37
2009-06-30	17
2009-09-30	7
2009-12-31	22
2010-03-31	45
2010-06-30	244
2010-09-30	106
2010-12-31	461
2011-03-31	18
2011-06-30	33
2011-09-30	28
2011-12-31	53
2012-03-31	52
2012-06-30	38
2012-09-30	20
2012-12-31	84
2013-03-31	54
2013-06-30	37
2013-09-30	26
2013-12-31	31
2014-03-31	41
2014-06-30	47
2014-09-30	29
2014-12-31	79
2015-03-31	116
2015-06-30	258
2015-09-30	314
2015-12-31	267
2016-03-31	461
2016-06-30	122
2016-09-30	231
2016-12-31	151
2017-03-31	29
2017-06-30	23
2017-09-30	28
2017-12-31	118
2018-03-31	69
2018-06-30	86
2018-09-30	68
2018-12-31	74
2019-03-31	28
2019-06-30	20
2019-09-30	30
2019-12-31	24
2020-03-31	8
2020-06-30	96
2020-09-30	215
2020-12-31	277
2021-03-31	197
2021-06-30	46
2021-09-30	154
2021-12-31	110
2022-03-31	65
2022-06-30	67
2022-09-30	107
2022-12-31	65
2023-03-31	79
2023-06-30	103
2023-09-30	63