Quarter	Billions of US Dollars
1987-01-01	0.34249
1987-10-01	0.39111
1988-01-01	0.49250
1988-04-01	0.08020
1988-07-01	0.22270
1988-10-01	0.27180
1989-01-01	0.38530
1989-04-01	0.10220
1989-07-01	0.26340
1989-10-01	0.10510
1990-01-01	0.25900
1990-04-01	0.11960
1990-07-01	0.20000
1990-10-01	0.36400
1991-01-01	0.12850
1991-04-01	0.05375
1991-07-01	0.10000
1991-10-01	1.11648
1992-01-01	0.45665
1992-04-01	0.05160
1992-07-01	0.20000
1992-10-01	-0.19004
1993-01-01	1.27364
1993-04-01	0.94140
1993-07-01	1.51870
1993-10-01	0.63595
1994-01-01	0.96410
1994-04-01	0.14420
1994-07-01	0.50937
1994-10-01	0.48145
1995-01-01	-0.30697
1995-04-01	0.71280
1995-07-01	0.65470
1995-10-01	0.65753
1996-01-01	-0.04208
1996-04-01	0.64264
1996-07-01	-0.54258
1996-10-01	-0.12148
1997-01-01	-0.09222
1997-04-01	0.08316
1997-07-01	-0.12395
1997-10-01	-0.43642
1998-01-01	-0.38326
1998-04-01	0.05401
1998-07-01	0.00345
1998-10-01	0.03076
1999-01-01	-0.70855
1999-04-01	-0.69742
1999-07-01	-0.75777
1999-10-01	-0.38159
2000-01-01	-0.90331
2000-04-01	-0.52487
2000-07-01	-0.66087
2000-10-01	-0.11062
2001-01-01	-0.04595
2001-04-01	-0.32566
2001-07-01	0.00419
2001-10-01	-0.70989
2002-01-01	-0.49641
2002-04-01	0.23121
2002-07-01	-0.19554
2002-10-01	0.00454
2003-01-01	-0.54408
2003-04-01	-0.64532
2003-07-01	-0.73089
2003-10-01	-0.19516
2004-01-01	-1.56698
2004-04-01	0.00499
2004-07-01	0.00507
2004-10-01	0.00516
2005-01-01	-0.23351
2005-04-01	0.30533
2005-07-01	-0.23902
2005-10-01	-0.29831
2006-01-01	0.35559
2006-04-01	0.18738
2006-07-01	-0.03867
2006-10-01	2.50949
2007-01-01	0.39877
2007-04-01	0.45735
2007-07-01	0.05887
2007-10-01	-0.23635
2008-01-01	-0.23763
2008-04-01	-0.02172
2008-07-01	0.29085
2009-04-01	-0.45202
2009-10-01	0.04804
2010-01-01	-0.03301
2010-04-01	-0.36429
2010-07-01	-0.28035
2010-10-01	0.04401
2011-01-01	-0.66976
2011-04-01	0.88286
2011-07-01	0.78050
2011-10-01	-1.14653
2012-01-01	0.82310
2012-04-01	0.24601
2012-07-01	-0.10006
2012-10-01	0.32966
2013-01-01	0.50057
2013-04-01	0.99050
2013-07-01	0.97066
2013-10-01	0.37000
2014-01-01	1.17302
2014-04-01	0.85757
2014-07-01	0.07329
2014-10-01	0.48011
2015-01-01	0.24087
2015-04-01	-0.08741