Quarter	Billions of US Dollars
2011-01-01	0.10
2011-04-01	0.10
2011-07-01	0.10
2011-10-01	0.10
2012-01-01	0.10
2012-04-01	0.30
2012-07-01	0.30
2012-10-01	0.80
2013-01-01	1.30
2013-04-01	1.30
2013-07-01	1.30
2013-10-01	1.30
2014-01-01	1.60
2014-04-01	1.60
2014-07-01	2.60
2014-10-01	2.60
2015-01-01	2.60
2015-04-01	2.88