Quarter	US dollars
1999-09-30	69
1999-12-31	69
2000-03-31	61
2000-06-30	67
2000-09-30	41
2000-12-31	36
2001-03-31	36
2001-06-30	21
2001-09-30	16
2001-12-31	17
2002-03-31	16
2002-06-30	20
2002-09-30	17
2002-12-31	16
2003-03-31	6
2003-06-30	10
2003-09-30	23
2003-12-31	25
2004-03-31	24
2004-06-30	31
2004-09-30	18
2004-12-31	19
2005-03-31	17
2005-06-30	11
2005-09-30	5
2005-12-31	5
2006-03-31	9
2006-06-30	17
2006-09-30	22
2006-12-31	27
2007-03-31	31
2007-06-30	36
2007-09-30	31
2007-12-31	30
2008-03-31	38
2008-06-30	38
2008-09-30	50
2008-12-31	16
2009-03-31	9
2009-06-30	12
2009-09-30	8
2009-12-31	8
2010-03-31	15
2010-06-30	40
2010-09-30	22
2010-12-31	9
2011-03-31	22
2011-06-30	18
2011-09-30	30
2011-12-31	538
2012-03-31	78
2012-06-30	41
2012-09-30	18
2012-12-31	23
2013-03-31	9
2013-06-30	9
2013-09-30	8
2013-12-31	12
2014-03-31	17
2014-06-30	15
2014-09-30	144
2014-12-31	140
2015-03-31	367
2015-06-30	363
2015-09-30	226
2015-12-31	212
2016-03-31	7
2016-06-30	11
2016-09-30	10
2016-12-31	11
2017-03-31	13
2017-06-30	16
2017-09-30	19
2017-12-31	8
2018-03-31	6
2018-06-30	21
2018-09-30	16
2018-12-31	5
2019-03-31	4
2019-06-30	81
2019-09-30	12
2019-12-31	-1
2020-03-31	1
2020-06-30	-1
2020-09-30	0
2020-12-31	3
2021-03-31	7
2021-06-30	4
2021-09-30	1
2021-12-31	3
2022-03-31	9
2022-06-30	9
2022-09-30	12
2022-12-31	13
2023-03-31	5
2023-06-30	1
2023-09-30	5