Quarter	US dollars
2004-12-31	0
2005-03-31	2
2005-06-30	-2
2005-09-30	-4
2005-12-31	-3
2006-03-31	-5
2006-06-30	-9
2006-09-30	-9
2006-12-31	-10
2007-03-31	-14
2007-06-30	-136
2007-09-30	-39
2007-12-31	-32
2008-03-31	-32
2008-06-30	-22
2008-09-30	-41
2008-12-31	-24
2009-03-31	-77
2009-06-30	-31
2009-09-30	-14
2009-12-31	-19
2010-03-31	-14
2010-06-30	-21
2010-09-30	-9
2010-12-31	-6
2011-03-31	-19
2011-06-30	-26
2011-09-30	23
2011-12-31	19
2012-03-31	-10
2012-06-30	39
2012-09-30	45
2012-12-31	44
2013-03-31	23
2013-06-30	-5
2013-09-30	0
2013-12-31	-83
2014-03-31	-162
2014-06-30	-217
2014-09-30	-246
2014-12-31	-1010
2015-03-31	-730
2015-06-30	-632
2015-09-30	-244
2015-12-31	-196
2016-03-31	-65
2016-06-30	-130
2016-09-30	-179
2016-12-31	-167
2017-03-31	-398
2017-06-30	-197
2017-09-30	-157
2017-12-31	-3
2018-03-31	6
2018-06-30	0
2018-09-30	0
2018-12-31	1
2019-03-31	-40
2019-06-30	6
2019-09-30	6
2019-12-31	5
2020-03-31	10
2020-06-30	11
2020-09-30	9
2020-12-31	-1
2021-03-31	8
2021-06-30	6
2021-09-30	7
2021-12-31	4
2022-03-31	0
2022-06-30	0
2022-09-30	0
2022-12-31	0
2023-03-31	0
2023-06-30	0
2023-09-30	0