Quarter	Millions of US Dollars
1989-07-01	100
1989-10-01	42
1994-07-01	5118
1996-07-01	-134
1997-07-01	32
1997-10-01	0
1998-01-01	0
1998-04-01	0
1998-07-01	1
1998-10-01	1
1999-01-01	1
1999-04-01	54
1999-07-01	1
1999-10-01	-57
2000-01-01	1
2000-04-01	1
2000-07-01	1
2000-10-01	1
2001-01-01	1
2001-04-01	1
2001-07-01	-15
2001-10-01	224
2002-01-01	-358
2002-04-01	-114
2002-07-01	-68
2002-10-01	-868
2003-01-01	-50
2003-04-01	8
2003-07-01	5
2003-10-01	1
2004-01-01	-10
2004-04-01	11
2004-07-01	-689
2004-10-01	259
2005-01-01	-829
2005-04-01	1
2005-07-01	-818
2005-10-01	-9
2006-01-01	26
2006-04-01	402
2006-07-01	-50
2006-10-01	223
2007-01-01	-327
2007-04-01	1
2007-07-01	1
2007-10-01	1
2008-01-01	-298
2008-04-01	-8
2008-07-01	483
2008-10-01	1
2009-01-01	1
2009-04-01	-36
2009-07-01	-49
2009-10-01	-26
2010-01-01	0
2010-04-01	0
2010-07-01	-342
2010-10-01	0
2011-01-01	0
2011-04-01	0
2011-07-01	0
2011-10-01	-134
2012-01-01	0
2012-04-01	0
2012-07-01	1204
2012-10-01	150
2013-01-01	-1078
2013-04-01	-424
2013-07-01	0
2013-10-01	1227
2014-01-01	0
2014-04-01	0
2014-07-01	1884
2014-10-01	0
2015-01-01	2978
2015-04-01	0
2015-07-01	-72
2015-10-01	135
2016-01-01	2209
2016-04-01	-52
2016-07-01	614
2016-10-01	104
2017-01-01	3
2017-04-01	12
2017-07-01	-1109
2017-10-01	77
2018-01-01	1
2018-04-01	464