Quarter	Billions of US Dollars
1998-01-01	0.10000
2002-04-01	-0.15000
2007-04-01	0.40570
2008-01-01	-0.10000
2009-10-01	-0.04793
2010-04-01	0.64107
2011-04-01	0.16500
2013-01-01	0.01396
2014-07-01	0.55723