Quarter	Millions of US Dollars
1996-04-01	30
1997-04-01	130
1999-01-01	-6
2000-04-01	-57
2001-04-01	-30
2001-10-01	-11
2002-04-01	-32
2011-10-01	247
2012-01-01	701
2013-10-01	0
2014-04-01	7
2014-07-01	3
2014-10-01	8
2016-07-01	-3
2016-10-01	-194
2017-07-01	562