Quarter	US dollars
1999-03-31	17
1999-06-30	17
1999-09-30	54
1999-12-31	15
2000-03-31	15
2000-06-30	14
2000-09-30	13
2000-12-31	12
2001-03-31	11
2001-06-30	11
2001-09-30	11
2001-12-31	15
2002-03-31	14
2002-06-30	11
2002-09-30	11
2002-12-31	111
2003-03-31	86
2003-06-30	51
2003-09-30	56
2003-12-31	51
2004-03-31	56
2004-06-30	55
2004-09-30	14
2004-12-31	15
2005-03-31	14
2005-06-30	21
2005-09-30	35
2005-12-31	37
2006-03-31	32
2006-06-30	24
2006-09-30	36
2006-12-31	35
2007-03-31	33
2007-06-30	26
2007-09-30	28
2007-12-31	25
2008-03-31	28
2008-06-30	20
2008-09-30	26
2008-12-31	19
2009-03-31	19
2009-06-30	20
2009-09-30	20
2009-12-31	21
2010-03-31	23
2010-06-30	21
2010-09-30	24
2010-12-31	20
2011-03-31	19
2011-06-30	20
2011-09-30	25
2011-12-31	26
2012-03-31	26
2012-06-30	22
2012-09-30	23
2012-12-31	24
2013-03-31	19
2013-06-30	21
2013-09-30	19
2013-12-31	20
2014-03-31	20
2014-06-30	17
2014-09-30	16
2014-12-31	16
2015-03-31	17
2015-06-30	13
2015-09-30	13
2015-12-31	12
2016-03-31	9
2016-06-30	12
2016-09-30	12
2016-12-31	18
2017-03-31	7
2017-06-30	7
2017-09-30	9
2017-12-31	8
2018-03-31	7
2018-06-30	36
2018-09-30	46
2018-12-31	36
2019-03-31	37
2019-06-30	7
2019-09-30	7
2019-12-31	7
2020-03-31	7
2020-06-30	6
2020-09-30	10
2020-12-31	7
2021-03-31	5
2021-06-30	5
2021-09-30	6
2021-12-31	33
2022-03-31	11
2022-06-30	7
2022-09-30	7
2022-12-31	6
2023-03-31	6
2023-06-30	6
2023-09-30	7