Quarter	Billions of US Dollars
1972-10-01	0.01000
1973-01-01	0.01400
1979-10-01	-0.01000
1988-01-01	-0.01400
1996-10-01	0.07500
1997-07-01	0.20000
1997-10-01	-0.00488
1998-04-01	0.25000
1999-10-01	-0.07012
2000-01-01	0.19598
2000-07-01	0.22500
2001-01-01	0.16567
2001-04-01	0.40000
2001-10-01	0.25000
2002-04-01	0.30000
2002-07-01	-0.20000
2003-01-01	-0.21463
2004-01-01	0.24789
2004-04-01	0.12500
2004-07-01	0.03394
2004-10-01	0.18624
2005-04-01	0.05000
2005-07-01	0.50000
2005-10-01	0.25000
2006-01-01	0.35000
2006-07-01	0.33000
2006-10-01	0.20000
2007-01-01	1.75000
2007-04-01	0.12500
2007-07-01	-0.22500
2007-10-01	0.15000
2008-04-01	0.35000
2009-01-01	0.06035
2009-07-01	0.14572
2009-10-01	0.50000
2010-01-01	0.76071
2010-07-01	-0.01428
2010-10-01	0.30000
2011-01-01	0.38571
2011-04-01	-0.40000
2011-07-01	-0.01428
2011-10-01	0.57407
2012-01-01	0.25000
2012-07-01	0.78554
2012-10-01	-1.40000
2013-01-01	1.20000
2013-07-01	-0.02857
2013-10-01	0.50000
2014-01-01	-0.01429
2014-04-01	0.50500
2014-07-01	0.78571
2014-10-01	-0.18736
2015-01-01	0.92500
2015-04-01	-1.10000