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
1993-10-01	0.00700
1994-01-01	0.14650
1994-04-01	-0.04800
1994-07-01	0.02950
1994-10-01	-0.17620
1995-01-01	-0.02150
1995-04-01	-0.02550
1995-07-01	-0.00477
1995-10-01	-0.01328
1996-01-01	0.14500
1996-04-01	-0.10500
1996-10-01	-0.08729
1997-01-01	-0.06957
1997-04-01	0.13400
1997-07-01	0.05000
1997-10-01	0.00800
1998-04-01	0.00200
1998-10-01	-0.01000
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	0.55000
2004-10-01	0.65000
2005-04-01	0.02500
2005-07-01	0.12193
2005-10-01	0.91000
2006-01-01	0.20703
2006-04-01	0.00645
2006-07-01	0.74543
2006-10-01	1.52491
2007-01-01	4.47052
2007-04-01	2.41449
2007-07-01	-0.30280
2007-10-01	1.98712
2008-01-01	0.17575
2008-04-01	0.07822
2008-07-01	0.05000
2008-10-01	-0.30000
2009-01-01	-1.08108
2009-04-01	0.05000
2009-07-01	-0.38500
2009-10-01	0.93500
2010-01-01	0.41600
2010-04-01	-0.34771
2010-07-01	0.81168
2010-10-01	1.76594
2011-01-01	2.69526
2011-04-01	3.22750
2011-07-01	-0.02856
2011-10-01	-1.84590
2012-01-01	2.63780
2012-04-01	0.32048
2012-07-01	2.98091
2012-10-01	-0.03440
2013-01-01	0.86802
2013-04-01	2.48401
2013-07-01	0.67970
2013-10-01	1.92210
2014-01-01	1.05333
2014-04-01	3.20537
2014-07-01	1.08282
2014-10-01	0.86586
2015-01-01	-0.28538
2015-04-01	1.54424