Quarter	Millions of US Dollars
2002-04-01	35
2002-07-01	79
2002-10-01	18
2003-01-01	14
2003-04-01	4
2003-07-01	22
2003-10-01	-12
2004-01-01	-36
2004-04-01	7
2004-07-01	29
2004-10-01	-36
2005-01-01	-10
2005-04-01	-2
2005-07-01	-1
2005-10-01	-7
2006-01-01	-3
2006-04-01	-8
2006-07-01	-8
2006-10-01	-10
2007-01-01	11
2007-04-01	9
2007-07-01	16
2007-10-01	-16
2008-01-01	-34
2008-04-01	-7
2008-07-01	28
2008-10-01	6
2009-01-01	29
2009-04-01	-9
2009-07-01	-49
2009-10-01	-9
2010-01-01	-22
2010-04-01	2
2010-07-01	1
2010-10-01	0
2011-01-01	38
2011-04-01	0
2011-07-01	3
2011-10-01	-6
2012-01-01	-38
2012-04-01	-7
2012-07-01	-20
2012-10-01	0
2013-01-01	-1
2013-04-01	-7
2013-07-01	0
2013-10-01	-15
2014-01-01	-19
2014-04-01	1
2014-07-01	0
2014-10-01	-1
2015-01-01	0
2015-04-01	0
2015-07-01	0
2015-10-01	0
2016-01-01	0
2016-04-01	0
2016-07-01	0
2016-10-01	1
2017-01-01	1
2017-04-01	0
2017-07-01	0
2017-10-01	-1
2018-01-01	0