Quarter	Billions of US Dollars
2007-01-01	0.17500
2010-01-01	0.08810
2011-04-01	1.00000
2012-01-01	-0.17500
2013-04-01	0.30000
2013-07-01	0.30000
2013-10-01	0.40000
2014-04-01	1.41855
2014-07-01	0.44760
2014-10-01	-0.00050
2015-01-01	-0.07452
2015-04-01	0.01280