Quarter	Billions of US Dollars
2003-07-01	0.20000
2003-10-01	0.20000
2004-01-01	0.20000
2004-04-01	0.20000
2008-01-01	0.05000
2008-04-01	0.05000
2008-07-01	0.05000
2008-10-01	0.05000
2011-01-01	0.15010
2011-04-01	0.35514
2011-07-01	0.35472
2011-10-01	0.35277
2012-01-01	0.20500
2012-10-01	0.25000
2013-01-01	0.25000
2013-04-01	0.25005
2013-07-01	0.25005
2013-10-01	0.00005
2015-01-01	0.04000
2015-04-01	0.04000