Quarter	Billions of US Dollars
1997-07-01	0.20000
1998-04-01	0.25000
2000-01-01	0.19598
2000-07-01	0.22500
2001-01-01	0.16567
2001-04-01	0.40000
2001-10-01	0.25000
2002-04-01	0.30000
2002-07-01	-0.20000
2003-01-01	-0.21463
2004-01-01	0.24789
2004-04-01	0.12500
2004-07-01	0.03394
2004-10-01	0.18624
2005-04-01	0.05000
2005-10-01	0.25000
2006-01-01	0.25000
2007-01-01	0.35000
2007-07-01	-0.22500
2007-10-01	0.15000
2008-04-01	0.35000
2009-01-01	-0.26036
2011-01-01	0.40000
2011-04-01	-0.40000
2012-07-01	-0.25018
2014-07-01	0.80000
2014-10-01	-0.18736
2015-04-01	-0.30000