Quarter	Billions of US Dollars
1987-01-01	0.29249
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	0.63145
1995-01-01	-0.37987
1995-04-01	0.71280
1995-07-01	0.65470
1995-10-01	0.65753
1996-01-01	0.03292
1996-04-01	0.71946
1996-07-01	-0.52655
1996-10-01	-0.01992
1997-01-01	0.24355
1997-04-01	0.39569
1997-07-01	1.35081
1997-10-01	1.36774
1998-01-01	-0.27266
1998-04-01	0.03751
1998-07-01	0.48363
1998-10-01	1.02460
1999-01-01	-0.78568
1999-04-01	-0.58405
1999-07-01	-0.36745
1999-10-01	0.73138
2000-01-01	-0.45228
2000-04-01	-1.08884
2000-07-01	-0.97525
2000-10-01	-0.11306
2001-01-01	0.55353
2001-04-01	-0.17139
2001-07-01	-0.07011
2001-10-01	0.36826
2002-01-01	-0.53611
2002-04-01	0.03795
2002-07-01	-0.34651
2002-10-01	-0.32255
2003-01-01	-0.18353
2003-04-01	0.10807
2003-07-01	0.13259
2003-10-01	0.67044
2004-01-01	-0.97254
2004-04-01	1.67031
2004-07-01	1.59023
2004-10-01	1.33290
2005-01-01	2.09161
2005-04-01	3.86139
2005-07-01	3.51071
2005-10-01	2.55789
2006-01-01	2.10507
2006-04-01	2.97990
2006-07-01	3.25759
2006-10-01	6.96074
2007-01-01	5.02876
2007-04-01	8.23412
2007-07-01	2.85488
2007-10-01	5.95267
2008-01-01	-0.48129
2008-04-01	2.47218
2008-07-01	-0.42148
2008-10-01	-3.10803
2009-01-01	0.55223
2009-04-01	-0.25762
2009-07-01	2.03692
2009-10-01	2.23489
2010-01-01	0.68297
2010-04-01	0.47637
2010-07-01	-1.53130
2010-10-01	4.75923
2011-01-01	-0.58001
2011-04-01	0.72773
2011-07-01	-0.40947
2011-10-01	-0.67185
2012-01-01	0.64714
2012-04-01	-0.65639
2012-07-01	5.74934
2012-10-01	4.19907
2013-01-01	3.18214
2013-04-01	6.12468
2013-07-01	1.94981
2013-10-01	-0.97757
2014-01-01	-2.52841
2014-04-01	-2.47503
2014-07-01	-3.37298
2014-10-01	-0.42439
2015-01-01	-1.99704
2015-04-01	1.97355