Quarter	Billions of US Dollars
1990-07-01	0.28000
1990-10-01	0.26000
1992-07-01	0.15000
1992-10-01	0.10000
1993-07-01	0.00600
1993-10-01	-0.00200
1994-01-01	0.00450
1994-04-01	-0.00850
1994-07-01	0.22400
1994-10-01	0.07500
1995-01-01	0.02000
1995-07-01	0.09000
1995-10-01	0.28000
1996-01-01	-0.02000
1996-07-01	0.02866
1996-10-01	0.26224
1997-01-01	0.38798
1997-04-01	0.24681
1997-07-01	-0.20895
1997-10-01	-0.03615
1998-01-01	-0.49390
1998-04-01	-0.03758
1998-07-01	-0.03669
1998-10-01	-0.13192
1999-07-01	-0.05900
1999-10-01	-0.07500
2000-01-01	-0.02500
2000-10-01	-0.10000
2001-07-01	-0.16500
2002-07-01	-0.17000
2002-10-01	0.15000
2003-01-01	0.00500
2003-04-01	0.52000
2003-07-01	0.15000
2004-01-01	0.28000
2005-07-01	0.10000
2005-10-01	-0.44000
2007-10-01	-0.15000
2008-04-01	-0.30000
2008-10-01	-0.15000
2009-01-01	-0.30000
2009-04-01	0.10000
2010-07-01	-0.10000
2013-01-01	0.37500
2013-04-01	0.26500
2015-01-01	0.50000