Quarter	Billions of US Dollars
2007-10-01	0.02723
2008-01-01	0.02587
2008-04-01	0.00368
2008-10-01	-0.02723
2009-01-01	-0.02587
2009-04-01	-0.00368
2010-07-01	0.36487
2010-10-01	0.40844
2011-01-01	0.05990
2011-07-01	-0.36487
2011-10-01	-0.40844
2012-01-01	-0.05990
2013-04-01	0.06807
2013-10-01	-0.06807
2014-01-01	0.02000
2015-01-01	-0.02000
2015-04-01	0.00000