Quarter	US dollars
1999-03-31	282
1999-06-30	210
1999-09-30	222
1999-12-31	195
2000-03-31	165
2000-06-30	151
2000-09-30	155
2000-12-31	150
2001-03-31	89
2001-06-30	85
2001-09-30	74
2001-12-31	75
2002-03-31	48
2002-06-30	44
2002-09-30	26
2002-12-31	26
2003-03-31	21
2003-06-30	32
2003-09-30	23
2003-12-31	20
2004-03-31	19
2004-06-30	19
2004-09-30	19
2004-12-31	19
2005-03-31	30
2005-06-30	30
2005-09-30	29
2005-12-31	30
2006-03-31	24
2006-06-30	24
2006-09-30	19
2006-12-31	18
2007-03-31	25
2007-06-30	21
2007-09-30	42
2007-12-31	44
2008-03-31	46
2008-06-30	48
2008-09-30	47
2008-12-31	73
2009-03-31	77
2009-06-30	78
2009-09-30	92
2009-12-31	91
2010-03-31	89
2010-06-30	94
2010-09-30	61
2010-12-31	56
2011-03-31	37
2011-06-30	40
2011-09-30	41
2011-12-31	42
2012-03-31	46
2012-06-30	36
2012-09-30	43
2012-12-31	55
2013-03-31	171
2013-06-30	119
2013-09-30	197
2013-12-31	35
2014-03-31	55
2014-06-30	40
2014-09-30	54
2014-12-31	21
2015-03-31	134
2015-06-30	15
2015-09-30	24
2015-12-31	48
2016-03-31	12
2016-06-30	23
2016-09-30	26
2016-12-31	14
2017-03-31	31
2017-06-30	16
2017-09-30	34
2017-12-31	33
2018-03-31	14
2018-06-30	13
2018-09-30	21
2018-12-31	23
2019-03-31	22
2019-06-30	21
2019-09-30	17
2019-12-31	17
2020-03-31	24
2020-06-30	14
2020-09-30	24
2020-12-31	40
2021-03-31	5
2021-06-30	5
2021-09-30	5
2021-12-31	4
2022-03-31	5
2022-06-30	5
2022-09-30	16
2022-12-31	14
2023-03-31	2
2023-06-30	4
2023-09-30	7