Quarter	Billions of US Dollars
1989-07-01	0.09970
1989-10-01	0.04200
1996-07-01	-0.13352
1999-10-01	-0.05740
2005-07-01	0.15877
2006-01-01	0.02540
2008-07-01	-0.15013
2012-10-01	0.15000
2014-07-01	-0.15000