Quarter	Billions of US Dollars
2007-07-01	0.01208
2007-10-01	0.06075
2008-01-01	0.05985
2008-04-01	0.05572
2008-07-01	0.04076
2011-01-01	0.34277
2011-04-01	0.45445
2011-07-01	0.41432
2011-10-01	0.38060
2012-01-01	0.09810
2013-01-01	0.27811
2013-04-01	0.34382
2013-07-01	0.28475
2013-10-01	0.32515
2014-01-01	0.18303
2014-04-01	0.40750
2014-07-01	0.43348
2014-10-01	0.40634
2015-01-01	0.20105
2015-04-01	0.08486