Quarter	Billions of US Dollars
1993-07-01	0.09000
1994-07-01	-0.09000
1997-07-01	0.00521
1997-10-01	0.05389
1998-01-01	-4.04576
1998-04-01	-0.02823
1998-07-01	-0.01142
1998-10-01	-0.01439
1999-01-01	-0.00503
2005-04-01	0.26250
2005-07-01	0.02600
2005-10-01	0.05700
2006-01-01	0.04823
2006-04-01	0.00450
2006-07-01	0.14269
2006-10-01	0.06250
2007-01-01	0.19000
2007-07-01	0.07061
2007-10-01	0.02444
2008-01-01	-0.15099
2008-04-01	1.05791
2008-07-01	-0.38000
2009-01-01	0.00000
2009-04-01	0.20220
2010-01-01	0.49966
2010-04-01	0.35000
2010-07-01	-0.08000
2010-10-01	0.05000
2011-01-01	0.26150
2011-07-01	-0.21200
2011-10-01	-0.04200
2012-01-01	-0.21500
2012-04-01	0.17300
2012-07-01	0.04000
2012-10-01	0.02900
2013-01-01	0.03225
2013-04-01	-0.06820
2013-07-01	0.01180
2013-10-01	0.01020
2014-01-01	-0.19414
2014-04-01	-0.18977
2014-07-01	-0.11464
2014-10-01	0.09566
2015-01-01	-0.56250
2015-04-01	0.45874