Quarter	Billions of US Dollars
1987-10-01	-0.20000
2004-10-01	0.18670
2005-10-01	0.70000
2006-04-01	1.00000
2006-07-01	0.04052
2006-10-01	0.50000
2008-07-01	-0.04656
2009-01-01	0.08210
2009-07-01	0.01000
2009-10-01	-0.01000
2010-01-01	0.84330
2010-10-01	-0.70000
2011-04-01	-1.00000
2011-07-01	0.15000
2011-10-01	-0.10000
2012-01-01	-0.05000
2012-04-01	0.75000
2013-04-01	0.20000
2014-01-01	0.00988
2014-04-01	0.35000
2014-07-01	0.00831
2014-10-01	0.03185
2015-01-01	-0.84333
2015-04-01	-0.01533