Quarter	Billions of US Dollars
2006-04-01	0.50000
2006-10-01	0.34000
2010-10-01	0.75000
2011-10-01	-0.50000
2012-10-01	1.45000
2013-04-01	0.17277
2013-07-01	0.84000
2013-10-01	0.68826
2014-01-01	0.01635
2014-04-01	0.05128
2014-07-01	-0.13873
2014-10-01	0.56370
2015-01-01	0.47129
2015-04-01	-0.08112