Quarter	Billions of US Dollars
1991-01-01	-0.04588
1992-07-01	0.10000
1993-01-01	0.20000
1993-07-01	0.01000
1993-10-01	0.17500
1994-01-01	0.73000
1994-04-01	0.13880
1994-07-01	0.30000
1994-10-01	0.11470
1995-01-01	0.10050
1995-04-01	0.01500
1995-07-01	0.09000
1995-10-01	0.40300
1996-01-01	0.51867
1996-04-01	0.14000
1996-07-01	1.00500
1996-10-01	0.42872
1997-01-01	0.42500
1997-04-01	0.10000
1997-07-01	-0.10000
1997-10-01	-0.02000
1998-01-01	-0.22000
1998-10-01	-0.08845
1999-01-01	-0.06832
1999-04-01	-0.27461
1999-10-01	-0.15308
2000-01-01	-0.10000
2000-10-01	-0.10000
2001-01-01	-0.25250
2001-07-01	-0.81000
2001-10-01	-0.20000
2002-04-01	-0.12000
2002-10-01	-0.05000
2004-01-01	-0.62500
2004-04-01	0.15000
2004-07-01	0.05130
2005-01-01	0.40000
2005-04-01	0.16000
2005-07-01	-0.30000
2006-01-01	-0.15000
2006-04-01	0.49000
2006-07-01	0.30000
2006-10-01	0.43850
2007-01-01	-0.30000
2008-01-01	0.15000
2009-04-01	-0.45000
2009-07-01	-0.26751
2009-10-01	-0.15000
2010-01-01	-0.25000
2010-04-01	-0.33620
2010-10-01	1.35000
2011-04-01	0.25620
2011-07-01	-0.30000
2012-01-01	1.20000
2012-07-01	1.70000
2013-01-01	0.35000
2013-04-01	0.12500
2013-10-01	1.00000
2014-04-01	1.45000
2014-10-01	-0.10000
2015-01-01	0.04776