Quarter	Billions of US Dollars
2008-01-01	0.01360
2008-04-01	0.02600
2008-07-01	0.01000
2009-04-01	-0.02600
2011-07-01	-0.01000
2012-07-01	-0.01360
2014-04-01	0.86620
2014-07-01	0.00975
2014-10-01	0.05000
2015-01-01	0.11800
2015-04-01	-0.00095