Quarter	Billions of US Dollars
1975-01-01	0.06000
1975-04-01	0.04000
1983-01-01	-0.06000
1983-04-01	-0.04000
1996-01-01	0.05000
1996-04-01	0.72151
1996-10-01	0.27166
1997-01-01	0.08590
1997-04-01	0.35178
1999-04-01	-0.65497
2000-01-01	-0.08761
2000-10-01	0.25950
2001-01-01	0.09231
2001-04-01	0.65182
2001-10-01	-0.12813
2002-04-01	0.34053
2002-10-01	0.43989
2003-07-01	0.81357
2003-10-01	-0.17830
2004-04-01	-0.18061
2004-10-01	-0.04573
2005-04-01	0.56793
2005-10-01	-0.40223
2006-04-01	-0.04572
2006-10-01	-0.20691
2007-04-01	-0.04572
2007-10-01	-0.21962
2008-04-01	0.22929
2010-01-01	1.42908
2010-07-01	-0.90380
2011-04-01	2.15887
2012-01-01	3.25540
2012-04-01	-0.89743
2012-07-01	0.94346
2012-10-01	1.94589
2013-01-01	1.50000
2013-07-01	1.98674
2013-10-01	1.36479
2014-01-01	2.00000
2014-04-01	1.71397
2014-10-01	1.87356
2015-01-01	-1.12602
2015-04-01	-0.55238