Quarter	US dollars
2004-12-31	-2
2005-03-31	-6
2005-06-30	-2
2005-09-30	0
2005-12-31	-7
2006-03-31	-7
2006-06-30	-9
2006-09-30	-7
2006-12-31	-10
2007-03-31	-12
2007-06-30	-12
2007-09-30	-12
2007-12-31	-12
2008-03-31	-14
2008-06-30	-18
2008-09-30	-18
2008-12-31	-17
2009-03-31	-14
2009-06-30	-13
2009-09-30	-13
2009-12-31	-8
2010-03-31	-8
2010-06-30	-10
2010-09-30	-11
2010-12-31	-9
2011-03-31	-11
2011-06-30	-13
2011-09-30	-14
2011-12-31	-14
2012-03-31	-11
2012-06-30	-9
2012-09-30	-10
2012-12-31	-6
2013-03-31	-9
2013-06-30	-9
2013-09-30	-8
2013-12-31	-15
2014-03-31	-22
2014-06-30	-15
2014-09-30	-16
2014-12-31	-19
2015-03-31	-16
2015-06-30	-30
2015-09-30	-20
2015-12-31	-15
2016-03-31	-27
2016-06-30	-48
2016-09-30	-30
2016-12-31	-22
2017-03-31	-21
2017-06-30	-22
2017-09-30	-28
2017-12-31	-30
2018-03-31	-14
2018-06-30	-1
2018-09-30	-5
2018-12-31	-20
2019-03-31	-18
2019-06-30	-6
2019-09-30	0
2019-12-31	0
2020-03-31	0
2020-06-30	0
2020-09-30	-8
2020-12-31	-8
2021-03-31	0
2021-06-30	0
2021-09-30	0
2021-12-31	-7
2022-03-31	-7
2022-06-30	0
2022-09-30	0
2022-12-31	0
2023-03-31	0
2023-06-30	0
2023-09-30	0