Quarter	Billions of US Dollars
2007-07-01	0.547
2007-10-01	0.563
2008-01-01	0.617
2008-10-01	0.726
2009-01-01	1.821
2009-04-01	1.330
2009-07-01	0.628
2009-10-01	0.792
2010-01-01	0.644
2010-04-01	0.684
2010-07-01	1.596
2010-10-01	1.999
2011-01-01	1.989
2011-04-01	1.771
2011-07-01	1.675
2011-10-01	2.275
2012-01-01	2.383
2012-04-01	2.001
2012-07-01	1.945
2012-10-01	1.441
2013-01-01	1.323
2013-04-01	1.385
2013-07-01	1.172
2013-10-01	1.702
2014-01-01	1.364
2014-04-01	1.375
2014-07-01	0.856
2014-10-01	0.363
2015-01-01	0.354