Quarter	Billions of US Dollars
1991-01-01	-0.04588
1993-07-01	0.01000
1993-10-01	0.17500
1994-01-01	0.15500
1994-04-01	0.05880
1994-10-01	0.06470
1995-01-01	0.00050
1995-04-01	0.01500
1995-07-01	0.04000
1995-10-01	0.40300
1996-01-01	0.22000
1996-04-01	0.01000
1996-07-01	0.74000
1996-10-01	0.30872
1997-01-01	0.40500
1997-04-01	0.10000
1998-10-01	-0.08345
1999-04-01	-0.04961
1999-10-01	-0.05308
2000-10-01	-0.10000
2001-01-01	-0.07500
2001-07-01	-0.55000
2001-10-01	-0.20000
2002-04-01	-0.12000
2004-01-01	-0.15000
2004-07-01	0.25130
2005-01-01	0.40000
2005-04-01	0.16000
2005-07-01	-0.30000
2006-04-01	0.32000
2006-07-01	0.30000
2006-10-01	0.06850
2007-01-01	-0.30000
2008-01-01	0.15000
2009-07-01	-0.26751
2010-01-01	-0.25000
2010-04-01	-0.33620
2010-10-01	0.15000
2011-04-01	-0.14380
2011-07-01	-0.30000
2013-01-01	-0.15000
2013-04-01	0.12500
2014-10-01	-0.10000
2015-01-01	0.04776