Quarter	US dollars
1999-03-31	18
1999-06-30	18
1999-09-30	14
1999-12-31	14
2000-03-31	14
2000-06-30	14
2000-09-30	14
2000-12-31	14
2001-03-31	14
2001-06-30	14
2001-09-30	14
2001-12-31	14
2002-03-31	15
2002-06-30	14
2002-09-30	10
2002-12-31	9
2003-03-31	8
2003-06-30	5
2003-09-30	6
2003-12-31	7
2004-03-31	15
2004-06-30	15
2004-09-30	3
2004-12-31	2
2005-03-31	3
2005-06-30	4
2005-09-30	5
2005-12-31	4
2006-03-31	44
2006-06-30	45
2006-09-30	44
2006-12-31	44
2007-03-31	44
2007-06-30	45
2007-09-30	47
2007-12-31	50
2008-03-31	46
2008-06-30	45
2008-09-30	42
2008-12-31	42
2009-03-31	39
2009-06-30	38
2009-09-30	36
2009-12-31	132
2010-03-31	135
2010-06-30	102
2010-09-30	178
2010-12-31	130
2011-03-31	19
2011-06-30	8
2011-09-30	20
2011-12-31	9
2012-03-31	19
2012-06-30	16
2012-09-30	9
2012-12-31	8
2013-03-31	9
2013-06-30	34
2013-09-30	33
2013-12-31	18
2014-03-31	18
2014-06-30	20
2014-09-30	10
2014-12-31	10
2015-03-31	8
2015-06-30	10
2015-09-30	19
2015-12-31	20
2016-03-31	35
2016-06-30	31
2016-09-30	32
2016-12-31	26
2017-03-31	17
2017-06-30	27
2017-09-30	25
2017-12-31	16
2018-03-31	22
2018-06-30	20
2018-09-30	22
2018-12-31	22
2019-03-31	12
2019-06-30	15
2019-09-30	14
2019-12-31	36
2020-03-31	57
2020-06-30	34
2020-09-30	28
2020-12-31	20
2021-03-31	22
2021-06-30	16
2021-09-30	12
2021-12-31	20
2022-03-31	7
2022-06-30	40
2022-09-30	51
2022-12-31	60
2023-03-31	73
2023-06-30	49
2023-09-30	4