Quarter	Billions of US Dollars
1987-04-01	-0.07000
1987-10-01	-0.02500
1988-10-01	-0.05000
1991-10-01	0.07500
1992-01-01	0.10000
1992-04-01	0.12000
1992-07-01	0.19500
1992-10-01	0.13500
1993-01-01	0.33000
1993-04-01	0.01500
1993-07-01	0.38000
1993-10-01	0.52540
1994-01-01	0.44100
1994-04-01	-0.03450
1994-07-01	0.36784
1994-10-01	0.18060
1995-01-01	-0.36068
1995-04-01	-0.03420
1995-07-01	-0.01094
1995-10-01	-0.13668
1996-01-01	-0.24804
1996-04-01	0.42224
1996-07-01	0.15307
1996-10-01	0.22305
1997-01-01	0.09212
1997-04-01	0.30210
1997-07-01	0.88366
1997-10-01	-0.26170
1998-01-01	0.28247
1998-04-01	1.21969
1998-07-01	-0.90524
1998-10-01	-0.00529
1999-01-01	-0.10797
1999-04-01	0.00792
1999-07-01	-0.11621
1999-10-01	0.11184
2000-01-01	0.21770
2000-04-01	-0.17660
2000-07-01	-0.49342
2000-10-01	-0.26600
2001-01-01	0.08638
2001-04-01	-0.81077
2001-07-01	-0.16294
2001-10-01	-0.10261
2002-01-01	-0.33746
2002-04-01	-0.15755
2002-07-01	-0.29000
2002-10-01	-0.24278
2003-01-01	-0.12500
2003-04-01	0.00175
2003-07-01	0.00000
2003-10-01	-0.56235
2004-01-01	0.53294
2004-04-01	-0.08500
2004-10-01	-0.01129
2005-01-01	-0.15000
2005-04-01	-0.21503
2005-10-01	0.08800
2006-01-01	0.14000
2006-04-01	0.25000
2006-07-01	-0.10000
2006-10-01	0.15000
2007-01-01	0.05000
2007-04-01	0.57092
2008-10-01	-0.15000
2009-01-01	0.00000
2009-04-01	0.00210
2010-04-01	-0.26806
2010-07-01	-0.10794
2010-10-01	-0.20000
2011-01-01	-0.07500
2011-04-01	0.30000
2012-04-01	-0.27500
2013-10-01	-0.62559