Quarter	Billions of US Dollars
1987-01-01	0.19150
1987-07-01	0.11650
1988-01-01	0.11240
1988-04-01	0.15760
1988-07-01	0.10637
1988-10-01	0.08260
1990-07-01	-0.03862
1991-04-01	0.12500
1991-10-01	0.02240
1992-01-01	-0.15549
1992-04-01	0.11093
1992-07-01	0.07000
1992-10-01	0.26500
1993-01-01	-0.32228
1993-04-01	0.37500
1993-07-01	0.75874
1993-10-01	0.69010
1994-01-01	0.07238
1994-04-01	0.69820
1994-07-01	0.36900
1994-10-01	0.27841
1995-01-01	-0.31166
1995-04-01	0.18850
1995-07-01	1.22716
1995-10-01	0.05599
1996-01-01	-0.29931
1996-04-01	0.71741
1996-07-01	2.00004
1996-10-01	1.16144
1997-01-01	0.78276
1997-04-01	1.50384
1997-07-01	1.99950
1997-10-01	-0.14945
1998-01-01	0.56159
1998-04-01	-0.28135
1998-07-01	-0.54842
1998-10-01	-0.46543
1999-01-01	-0.40797
1999-04-01	-0.47521
1999-07-01	-0.34000
1999-10-01	-0.59161
2000-01-01	0.53735
2000-04-01	-0.27841
2000-07-01	-0.73926
2000-10-01	1.27760
2001-01-01	-1.29196
2001-04-01	0.22639
2001-07-01	-0.82227
2001-10-01	1.23360
2002-01-01	-0.13573
2002-04-01	4.02313
2002-07-01	0.53927
2002-10-01	2.34498
2003-01-01	-0.20926
2003-04-01	0.36142
2003-07-01	1.21085
2003-10-01	0.11108
2004-01-01	0.41182
2004-04-01	0.63321
2004-07-01	0.58069
2004-10-01	0.91429
2005-01-01	1.45520
2005-04-01	0.46883
2005-07-01	0.93299
2005-10-01	-0.43482
2006-01-01	3.01155
2006-04-01	-0.06013
2006-07-01	0.32347
2006-10-01	2.57188
2007-01-01	0.25399
2007-04-01	1.35484
2007-07-01	0.23688
2007-10-01	-0.25152
2008-01-01	0.66914
2008-04-01	2.69210
2008-07-01	0.28592
2008-10-01	-0.21001
2009-01-01	-0.30568
2009-04-01	-2.17321
2009-07-01	6.20459
2009-10-01	0.39622
2010-01-01	-0.85998
2010-04-01	-0.20881
2010-07-01	1.31462
2010-10-01	-1.06916
2011-01-01	3.12751
2011-04-01	0.99474
2011-07-01	-0.09490
2011-10-01	1.03869
2012-01-01	1.09831
2012-04-01	2.44949
2012-07-01	0.43000
2012-10-01	5.36669
2013-01-01	0.27292
2013-04-01	6.62901
2013-07-01	2.32009
2013-10-01	3.04141
2014-01-01	1.96224
2014-04-01	1.91889
2014-07-01	-0.33486
2014-10-01	2.24231
2015-01-01	4.36995
2015-04-01	8.81765