Quarter	Billions of US Dollars
2007-07-01	0.01184
2007-10-01	0.04852
2011-01-01	0.33805
2011-04-01	0.11225
2013-01-01	0.27926
2013-04-01	0.09655
2013-10-01	0.03626
2014-01-01	0.14163
2014-04-01	0.22556
2014-07-01	0.03663
2014-10-01	0.02060
2015-04-01	0.02998