Quarter	US dollars
1999-09-30	10
1999-12-31	6
2000-03-31	5
2000-06-30	15
2000-09-30	9
2000-12-31	25
2001-03-31	6
2001-06-30	6
2001-09-30	12
2001-12-31	6
2002-03-31	3
2002-06-30	17
2002-09-30	8
2002-12-31	13
2003-03-31	13
2003-06-30	13
2003-09-30	18
2003-12-31	18
2004-03-31	15
2004-06-30	13
2004-09-30	14
2004-12-31	13
2005-03-31	13
2005-06-30	11
2005-09-30	11
2005-12-31	2
2006-03-31	2
2006-06-30	2
2006-09-30	0
2006-12-31	0
2007-03-31	2
2007-06-30	6
2007-09-30	6
2007-12-31	8
2008-03-31	22
2008-06-30	12
2008-09-30	12
2008-12-31	9
2009-03-31	4
2009-06-30	5
2009-09-30	11
2009-12-31	6
2010-03-31	9
2010-06-30	15
2010-09-30	13
2010-12-31	9
2011-03-31	14
2011-06-30	18
2011-09-30	11
2011-12-31	9
2012-03-31	18
2012-06-30	16
2012-09-30	16
2012-12-31	21
2013-03-31	36
2013-06-30	21
2013-09-30	18
2013-12-31	21
2014-03-31	20
2014-06-30	27
2014-09-30	36
2014-12-31	52
2015-03-31	61
2015-06-30	41
2015-09-30	56
2015-12-31	41
2016-03-31	53
2016-06-30	58
2016-09-30	51
2016-12-31	27
2017-03-31	26
2017-06-30	30
2017-09-30	31
2017-12-31	23
2018-03-31	10
2018-06-30	9
2018-09-30	7
2018-12-31	10
2019-03-31	18
2019-06-30	27
2019-09-30	38
2019-12-31	29
2020-03-31	64
2020-06-30	63
2020-09-30	58
2020-12-31	53
2021-03-31	36
2021-06-30	37
2021-09-30	38
2021-12-31	31
2022-03-31	13
2022-06-30	11
2022-09-30	7
2022-12-31	2
2023-03-31	0
2023-06-30	0
2023-09-30	0