Quarter	Billions of US Dollars
1987-01-01	0.06710
1987-10-01	0.11252
1988-04-01	0.09450
1988-07-01	0.18490
1988-10-01	-0.00633
1989-04-01	0.10000
1989-10-01	0.13790
1990-10-01	-0.00600
1991-01-01	0.15150
1991-04-01	-0.03615
1991-07-01	-0.03645
1991-10-01	-0.00600
1992-10-01	-0.10000
1993-01-01	-0.19338
1993-04-01	-0.13629
1993-07-01	0.08100
1994-01-01	0.14350
1994-07-01	0.01950
1994-10-01	-0.18020
1995-01-01	-0.00250
1995-07-01	0.00523
1995-10-01	-0.01928
1996-01-01	0.14500
1996-04-01	-0.10000
1996-10-01	-0.08829
1997-01-01	-0.06957
1997-04-01	0.15000
1997-07-01	0.05000
1999-01-01	0.10000
1999-10-01	-0.19132
2000-04-01	-0.07500
2001-01-01	-0.16937
2002-07-01	-0.25000
2003-01-01	-0.15000
2003-10-01	0.30000
2004-01-01	0.30000
2004-04-01	-0.25000
2004-07-01	0.25000
2004-10-01	0.25000
2005-04-01	0.02500
2005-07-01	0.12193
2006-01-01	0.19303
2006-04-01	-0.01242
2006-07-01	0.35543
2006-10-01	0.52891
2007-01-01	2.56036
2007-04-01	0.48937
2007-07-01	-0.16537
2007-10-01	2.00000
2008-01-01	0.13987
2008-04-01	-0.01464
2008-10-01	-0.30000
2009-01-01	-0.30000
2009-07-01	-0.10000
2009-10-01	0.50000
2010-01-01	-0.20000
2010-04-01	0.20000
2010-07-01	-0.10332
2011-01-01	0.59328
2011-04-01	0.19363
2011-07-01	-0.02856
2011-10-01	-0.84590
2012-01-01	-1.20406
2012-04-01	-0.27023
2012-07-01	0.50000
2012-10-01	-1.50000
2013-01-01	0.58774
2013-04-01	0.19796
2014-04-01	1.40000
2014-07-01	-0.15000
2014-10-01	0.23997
2015-01-01	-0.50000
2015-04-01	0.71523