Quarter	Billions of US Dollars
2005-04-01	0.02445
2005-07-01	0.05493
2005-10-01	0.64017
2006-01-01	0.06010
2006-04-01	0.07701
2006-07-01	0.09155
2006-10-01	0.10688
2007-01-01	0.08734
2007-04-01	0.08176
2010-04-01	0.00054
2011-01-01	0.02045
2011-07-01	1.89407
2011-10-01	0.67634
2012-01-01	4.84755
2012-04-01	0.97995
2012-07-01	1.55747
2012-10-01	0.60717
2013-01-01	0.58737
2013-04-01	-0.20050
2013-07-01	-0.52776
2013-10-01	-0.73650
2014-01-01	-0.56641
2014-04-01	0.19200
2014-07-01	-0.30431
2014-10-01	-0.20169
2015-01-01	-0.11996
2015-04-01	-0.33706