Quarter	US dollars
1999-03-31	50
1999-06-30	46
1999-09-30	42
1999-12-31	28
2000-03-31	30
2000-06-30	36
2000-09-30	8
2000-12-31	29
2001-03-31	37
2001-06-30	71
2001-09-30	43
2001-12-31	31
2002-03-31	24
2002-06-30	29
2002-09-30	32
2002-12-31	65
2003-03-31	35
2003-06-30	119
2003-09-30	36
2003-12-31	39
2004-03-31	40
2004-06-30	21
2004-09-30	20
2004-12-31	37
2005-03-31	18
2005-06-30	16
2005-09-30	20
2005-12-31	15
2006-03-31	13
2006-06-30	15
2006-09-30	20
2006-12-31	25
2007-03-31	17
2007-06-30	18
2007-09-30	16
2007-12-31	22
2008-03-31	28
2008-06-30	29
2008-09-30	26
2008-12-31	158
2009-03-31	26
2009-06-30	97
2009-09-30	22
2009-12-31	25
2010-03-31	11
2010-06-30	15
2010-09-30	10
2010-12-31	9
2011-03-31	14
2011-06-30	15
2011-09-30	12
2011-12-31	12
2012-03-31	13
2012-06-30	11
2012-09-30	16
2012-12-31	16
2013-03-31	14
2013-06-30	15
2013-09-30	57
2013-12-31	14
2014-03-31	15
2014-06-30	13
2014-09-30	11
2014-12-31	12
2015-03-31	14
2015-06-30	13
2015-09-30	14
2015-12-31	30
2016-03-31	32
2016-06-30	52
2016-09-30	23
2016-12-31	17
2017-03-31	19
2017-06-30	22
2017-09-30	23
2017-12-31	53
2018-03-31	27
2018-06-30	24
2018-09-30	24
2018-12-31	23
2019-03-31	19
2019-06-30	16
2019-09-30	24
2019-12-31	23
2020-03-31	23
2020-06-30	20
2020-09-30	23
2020-12-31	24
2021-03-31	14
2021-06-30	10
2021-09-30	10
2021-12-31	9
2022-03-31	12
2022-06-30	10
2022-09-30	8
2022-12-31	9
2023-03-31	11
2023-06-30	11
2023-09-30	9