Quarter	Billions of US Dollars
2007-01-01	0.17500
2010-01-01	0.08810
2012-01-01	-0.17500
2013-04-01	0.30000
2013-07-01	0.30000
2014-04-01	1.13935
2014-07-01	0.45000
2015-01-01	-0.07382