Quarter	Billions of US Dollars
1987-10-01	-0.20000
2004-10-01	0.18670
2005-01-01	0.60000
2005-10-01	0.70000
2006-04-01	1.40816
2006-07-01	0.04052
2006-10-01	0.50000
2008-07-01	-0.04656
2009-01-01	0.08210
2009-10-01	0.20000
2010-01-01	0.24330
2010-10-01	-0.10000
2011-04-01	-1.46776
2013-10-01	-0.10000
2015-01-01	-0.84333