Quarter	Billions of US Dollars
1990-04-01	-0.05340
1996-04-01	0.07000
1999-01-01	0.16000
2003-04-01	-0.02500
2006-01-01	-0.16000
2006-07-01	0.20000
2007-01-01	0.25000
2007-10-01	0.06500
2008-04-01	-0.04500
2009-07-01	0.10000
2010-04-01	0.13000
2012-10-01	0.30000
2013-01-01	0.25000
2013-04-01	0.27087
2013-07-01	0.45814
2013-10-01	0.45000
2014-04-01	-0.10000
2014-10-01	0.07522
2015-01-01	-0.13000