Quarter	Billions of US Dollars
2006-10-01	0.92500
2010-10-01	0.32000
2012-01-01	0.02600
2012-10-01	0.02597
2013-01-01	-0.02601
2013-10-01	0.35000
2014-10-01	-0.32000
2015-04-01	1.00000