Quarter	US dollars
1999-03-31	7
1999-06-30	9
1999-09-30	10
1999-12-31	40
2000-03-31	48
2000-06-30	40
2000-09-30	40
2000-12-31	43
2001-03-31	43
2001-06-30	26
2001-09-30	58
2001-12-31	46
2002-03-31	34
2002-06-30	30
2002-09-30	59
2002-12-31	78
2003-03-31	53
2003-06-30	18
2003-09-30	74
2003-12-31	27
2004-03-31	26
2004-06-30	30
2004-09-30	60
2004-12-31	46
2005-03-31	10
2005-06-30	8
2005-09-30	7
2005-12-31	41
2006-03-31	7
2006-06-30	7
2006-09-30	6
2006-12-31	7
2007-03-31	11
2007-06-30	21
2007-09-30	16
2007-12-31	23
2008-03-31	16
2008-06-30	25
2008-09-30	8
2008-12-31	9
2009-03-31	15
2009-06-30	18
2009-09-30	27
2009-12-31	12
2010-03-31	15
2010-06-30	43
2010-09-30	79
2010-12-31	145
2011-03-31	127
2011-06-30	178
2011-09-30	41
2011-12-31	33
2012-03-31	46
2012-06-30	71
2012-09-30	52
2012-12-31	54
2013-03-31	37
2013-06-30	26
2013-09-30	37
2013-12-31	43
2014-03-31	34
2014-06-30	36
2014-09-30	33
2014-12-31	80
2015-03-31	62
2015-06-30	24
2015-09-30	27
2015-12-31	27
2016-03-31	21
2016-06-30	15
2016-09-30	18
2016-12-31	37
2017-03-31	44
2017-06-30	23
2017-09-30	34
2017-12-31	19
2018-03-31	23
2018-06-30	22
2018-09-30	22
2018-12-31	28
2019-03-31	21
2019-06-30	21
2019-09-30	27
2019-12-31	26
2020-03-31	25
2020-06-30	22
2020-09-30	24
2020-12-31	20
2021-03-31	20
2021-06-30	19
2021-09-30	18
2021-12-31	25
2022-03-31	40
2022-06-30	50
2022-09-30	69
2022-12-31	70
2023-03-31	55
2023-06-30	65
2023-09-30	56