Quarter	Billions of US Dollars
2012-04-01	0.06410
2012-07-01	0.13024
2012-10-01	2.05491
2013-01-01	2.74863
2013-04-01	3.14270
2013-07-01	2.65573
2013-10-01	2.77810
2014-01-01	3.09906
2014-04-01	2.97093
2014-07-01	3.38058
2014-10-01	3.49170
2015-01-01	3.55148
2015-04-01	5.95685