Quarter	Billions of US Dollars
2007-10-01	0.02723
2008-01-01	0.05310
2008-04-01	0.05677
2008-07-01	0.05677
2008-10-01	0.02954
2009-01-01	0.00368
2010-07-01	0.36487
2010-10-01	0.77332
2011-01-01	0.83322
2011-04-01	0.83322
2011-07-01	0.46835
2011-10-01	0.05990
2013-04-01	0.06807
2013-07-01	0.06807
2014-01-01	0.02000
2014-04-01	0.02000
2014-07-01	0.02000
2014-10-01	0.02000
2015-04-01	0.00000