Quarter	Billions of US Dollars
1987-04-01	0.08480
1988-07-01	-0.05359
1988-10-01	0.08280
1990-04-01	-0.04622
1992-04-01	-0.09292
1993-07-01	0.03850
1993-10-01	-0.08915
1994-01-01	0.01950
1994-04-01	-0.15600
1994-07-01	-0.11100
1994-10-01	-0.00050
1995-01-01	-0.01500
1995-04-01	-0.00900
1995-07-01	0.06000
1995-10-01	-0.01000
1996-04-01	0.00500
1996-07-01	0.05000
1997-01-01	0.02000
1997-04-01	-0.00500
1997-07-01	0.20500
1997-10-01	-0.00500
1998-01-01	-0.00500
1998-04-01	0.00500
1998-07-01	-0.07500
1999-01-01	-0.00250
1999-04-01	0.22135
1999-10-01	0.10000
2000-01-01	0.18681
2000-04-01	0.00500
2000-07-01	0.09500
2001-04-01	0.18604
2001-07-01	-0.10785
2001-10-01	0.05800
2002-01-01	-0.01500
2002-04-01	0.33653
2002-07-01	-0.15812
2002-10-01	-0.13058
2003-01-01	0.07737
2003-04-01	-0.12510
2003-07-01	-0.04000
2003-10-01	-0.02700
2004-01-01	0.01700
2004-04-01	-0.04000
2004-07-01	0.00500
2004-10-01	0.05050
2005-01-01	0.07944
2005-04-01	-0.02000
2005-07-01	0.38342
2005-10-01	0.53404
2006-01-01	0.45192
2006-04-01	-0.25118
2006-07-01	0.31000
2006-10-01	-0.02000
2007-04-01	0.46900
2007-07-01	0.24000
2007-10-01	0.06000
2008-01-01	-0.01000
2008-04-01	-0.04500
2008-07-01	-0.05500
2009-07-01	-0.02700
2009-10-01	0.73330
2010-01-01	-0.01200
2010-10-01	0.10000
2011-01-01	-0.50000
2011-07-01	-0.30000
2011-10-01	0.36790
2012-01-01	-0.56657
2012-04-01	-0.03900
2012-10-01	0.50000
2013-10-01	-0.10000
2014-10-01	-0.30000
2015-01-01	0.30000
2015-04-01	0.27140