Quarter	Billions of US Dollars
2012-04-01	0.06295
2012-07-01	0.19812
2012-10-01	2.22925
2013-01-01	3.06980
2013-04-01	4.00201
2013-07-01	3.94203
2013-10-01	4.38249
2014-01-01	4.91920
2014-04-01	4.77165
2014-07-01	4.78670
2014-10-01	5.15206
2015-01-01	5.16247
2015-04-01	7.59291