Quarter	Billions of US Dollars
2004-04-01	0.250
2006-10-01	0.025
2007-04-01	0.015
2009-04-01	-0.250
2011-10-01	-0.025
2012-04-01	-0.015
2013-01-01	0.500
2014-10-01	1.000
2015-04-01	0.300