Quarter	Billions of US Dollars
2006-10-01	0.00501
2007-01-01	0.00513
2007-04-01	-0.00066
2007-10-01	0.00431
2008-04-01	-0.00995
2008-10-01	-0.00433
2009-01-01	0.16300
2009-04-01	-0.10389
2009-07-01	0.00228
2009-10-01	0.00000
2010-01-01	-0.01974
2010-04-01	-0.03030
2011-04-01	0.00700
2012-04-01	-0.00688
2012-10-01	0.25997
2013-01-01	-0.09983
2013-10-01	-0.03521
2014-10-01	0.05378
2015-01-01	-0.04872
2015-04-01	-0.03028