Quarter	Billions of US Dollars
1987-01-01	0.47550
1987-04-01	0.47968
1987-07-01	0.12507
1987-10-01	0.02014
1988-01-01	0.88859
1988-04-01	0.84278
1988-07-01	0.14595
1988-10-01	0.45114
1989-01-01	0.82663
1989-04-01	-0.18397
1989-07-01	0.25118
1989-10-01	1.55901
1990-01-01	0.08060
1990-04-01	0.92815
1990-07-01	0.51719
1990-10-01	0.16277
1991-01-01	-0.11046
1991-04-01	1.47384
1991-07-01	0.39044
1991-10-01	0.18419
1992-01-01	0.94247
1992-04-01	0.67489
1992-07-01	1.65261
1992-10-01	0.27389
1993-01-01	1.43826
1993-04-01	0.55051
1993-07-01	2.18818
1993-10-01	1.29450
1994-01-01	1.47995
1994-04-01	1.52760
1994-07-01	-0.40159
1994-10-01	-0.11900
1995-01-01	-0.94854
1995-04-01	-0.83607
1995-07-01	1.09957
1995-10-01	0.46074
1996-01-01	2.16052
1996-04-01	0.68747
1996-07-01	1.63921
1996-10-01	1.22523
1997-01-01	0.39338
1997-04-01	-0.39613
1997-07-01	0.69663
1997-10-01	0.34809
1998-01-01	-1.13154
1998-04-01	-0.01532
1998-07-01	-0.92642
1998-10-01	-0.74718
1999-01-01	-0.41570
1999-04-01	1.72912
1999-07-01	0.71973
1999-10-01	1.71382
2000-01-01	3.88684
2000-04-01	2.80463
2000-07-01	1.40434
2000-10-01	1.02592
2001-01-01	-1.86652
2001-04-01	-0.32015
2001-07-01	-0.61266
2001-10-01	1.94179
2002-01-01	0.19212
2002-04-01	1.77458
2002-07-01	0.06874
2002-10-01	-2.03500
2003-01-01	0.45506
2003-04-01	2.42797
2003-07-01	2.74378
2003-10-01	3.15990
2004-01-01	0.83652
2004-04-01	-1.96720
2004-07-01	3.11453
2004-10-01	-0.62466
2005-01-01	0.67146
2005-04-01	5.09853
2005-07-01	-0.04020
2005-10-01	0.93839
2006-01-01	4.29897
2006-04-01	1.43262
2006-07-01	1.96238
2006-10-01	0.37093
2007-01-01	3.46992
2007-04-01	3.02051
2007-07-01	0.50051
2007-10-01	3.37247
2008-01-01	-1.64798
2008-04-01	3.06388
2008-07-01	3.83367
2008-10-01	-2.52187
2009-01-01	4.64559
2009-04-01	3.05542
2009-07-01	7.76193
2009-10-01	6.76601
2010-01-01	3.14898
2010-04-01	-0.49482
2010-07-01	0.49405
2010-10-01	0.85176
2011-01-01	1.32234
2011-04-01	4.70741
2011-07-01	-0.45320
2011-10-01	-2.51927
2012-01-01	2.15086
2012-04-01	4.62864
2012-07-01	0.45601
2012-10-01	9.79707
2013-01-01	5.88070
2013-04-01	1.40218
2013-07-01	1.00942
2013-10-01	-2.49008
2014-01-01	1.22733
2014-04-01	-2.90846
2014-07-01	3.67972
2014-10-01	2.78935
2015-01-01	-3.62534
2015-04-01	4.94100