Quarter	Billions of US Dollars
1987-01-01	-0.06649
1987-04-01	-0.01000
1987-07-01	-0.02839
1988-01-01	-0.12500
1989-01-01	-0.07911
1989-07-01	-0.00036
1990-01-01	-0.08872
1990-04-01	0.08564
1990-07-01	0.10000
1990-10-01	-0.15000
1991-10-01	0.29000
1992-01-01	-0.00040
1992-04-01	0.05909
1992-10-01	0.13980
1993-04-01	0.15970
1993-10-01	0.32500
1994-01-01	0.20000
1994-04-01	0.76494
1994-07-01	0.80230
1994-10-01	0.08020
1995-01-01	-0.37960
1995-04-01	-0.24619
1995-07-01	0.20035
1995-10-01	0.04340
1996-01-01	0.02586
1996-04-01	0.03068
1996-07-01	-0.03500
1996-10-01	-0.18001
1997-04-01	0.54229
1997-07-01	-0.00535
1997-10-01	-0.00184
1998-01-01	-0.17388
1998-04-01	-0.15218
1998-07-01	-0.25918
1998-10-01	-0.09292
1999-01-01	-0.26641
1999-04-01	-0.10214
1999-07-01	-0.20000
1999-10-01	0.24775
2000-04-01	-0.00237
2000-10-01	-0.00250
2001-04-01	-0.12762
2001-07-01	-0.06711
2001-10-01	-0.17777
2002-04-01	-0.14541
2002-10-01	-0.00306
2003-04-01	0.01750
2003-07-01	-0.00001
2003-10-01	-0.29973
2004-04-01	-0.01026
2004-10-01	-0.10065
2005-04-01	0.20141
2005-07-01	0.02500
2005-10-01	0.18000
2006-04-01	0.10000
2006-07-01	0.15000
2006-10-01	-0.25000
2007-01-01	0.23729
2007-04-01	0.50000
2007-07-01	0.14926
2007-10-01	0.39470
2008-04-01	0.53930
2008-10-01	-0.06000
2009-01-01	-0.61442
2009-04-01	-0.07925
2009-10-01	1.37393
2010-01-01	0.70000
2010-04-01	0.05854
2010-07-01	0.06000
2010-10-01	0.26895
2011-01-01	0.07502
2011-07-01	-0.01052
2011-10-01	-0.00773
2012-04-01	-0.21000
2012-07-01	0.29870
2012-10-01	1.41555
2013-01-01	-0.07248
2013-04-01	-0.06014
2013-07-01	0.01740
2013-10-01	-1.43000
2014-01-01	1.42500
2014-04-01	2.05124
2014-07-01	0.27595
2015-01-01	-0.00418
2015-04-01	-0.21000