Quarter	US dollars
2004-12-31	0
2005-03-31	-2
2005-06-30	0
2005-09-30	0
2005-12-31	0
2006-03-31	0
2006-06-30	0
2006-09-30	0
2006-12-31	0
2007-03-31	0
2007-06-30	4
2007-09-30	8
2007-12-31	10
2008-03-31	12
2008-06-30	22
2008-09-30	21
2008-12-31	22
2009-03-31	20
2009-06-30	20
2009-09-30	14
2009-12-31	10
2010-03-31	5
2010-06-30	-16
2010-09-30	-11
2010-12-31	-2
2011-03-31	0
2011-06-30	-6
2011-09-30	3
2011-12-31	34
2012-03-31	34
2012-06-30	33
2012-09-30	34
2012-12-31	34
2013-03-31	35
2013-06-30	35
2013-09-30	34
2013-12-31	31
2014-03-31	33
2014-06-30	34
2014-09-30	36
2014-12-31	34
2015-03-31	31
2015-06-30	31
2015-09-30	32
2015-12-31	33
2016-03-31	30
2016-06-30	24
2016-09-30	23
2016-12-31	23
2017-03-31	26
2017-06-30	22
2017-09-30	21
2017-12-31	16
2018-03-31	11
2018-06-30	11
2018-09-30	9
2018-12-31	9
2019-03-31	7
2019-06-30	6
2019-09-30	6
2019-12-31	5
2020-03-31	5
2020-06-30	5
2020-09-30	4
2020-12-31	3
2021-03-31	3
2021-06-30	3
2021-09-30	3
2021-12-31	3
2022-03-31	3
2022-06-30	2
2022-09-30	2
2022-12-31	2
2023-03-31	2
2023-06-30	3
2023-09-30	2