Quarter	Billions of US Dollars
1987-01-01	0.12884
1987-04-01	0.13640
1987-07-01	-0.07628
1987-10-01	0.07649
1988-01-01	0.09790
1988-04-01	0.22700
1988-07-01	0.36880
1988-10-01	0.11471
1989-01-01	0.41875
1989-04-01	0.24845
1989-07-01	0.19236
1989-10-01	0.37620
1990-01-01	0.45285
1990-04-01	0.55862
1990-07-01	0.57506
1990-10-01	0.62005
1991-01-01	-0.25334
1991-04-01	0.49349
1991-07-01	-0.11687
1991-10-01	0.04647
1992-01-01	-0.26504
1992-04-01	-0.57565
1992-07-01	0.11169
1992-10-01	-0.50299
1993-01-01	-0.55416
1993-04-01	-0.43866
1993-07-01	-0.01666
1993-10-01	-0.19196
1994-01-01	-0.48257
1994-04-01	-0.11294
1994-07-01	0.21107
1994-10-01	-0.39455
1995-01-01	-0.24657
1995-04-01	-0.12137
1995-07-01	-0.45352
1995-10-01	-0.01520
1996-01-01	-0.23261
1996-04-01	-0.55922
1996-07-01	-0.52857
1996-10-01	-0.04323
1997-01-01	-0.16209
1997-04-01	0.05200
1997-07-01	-0.01989
1997-10-01	-0.06928
1998-01-01	-0.21600
1998-04-01	-0.02048
1998-07-01	0.05000
1998-10-01	-0.21802
1999-01-01	-0.07382
1999-04-01	0.02215
1999-07-01	0.78421
1999-10-01	-0.03550
2000-01-01	0.83805
2000-04-01	-0.09551
2000-07-01	0.18732
2000-10-01	0.13705
2001-01-01	0.05591
2001-04-01	-0.02891
2001-07-01	0.03727
2001-10-01	-0.26491
2002-01-01	-0.30876
2002-04-01	-0.30047
2002-07-01	0.17036
2002-10-01	0.01990
2003-01-01	0.39626
2003-04-01	0.35381
2003-07-01	0.43910
2003-10-01	-0.67942
2004-01-01	1.52503
2004-04-01	0.14354
2004-07-01	-0.76967
2004-10-01	0.64861
2005-01-01	1.89454
2005-04-01	-0.08396
2005-07-01	-0.35472
2005-10-01	2.21540
2006-01-01	4.05098
2006-04-01	0.12560
2006-07-01	0.54819
2006-10-01	1.37713
2007-01-01	1.24675
2007-04-01	2.17612
2007-07-01	0.35090
2007-10-01	-0.68511
2008-01-01	-1.99468
2008-04-01	1.78366
2008-07-01	1.59670
2008-10-01	2.52096
2009-01-01	0.08685
2009-04-01	2.60487
2009-07-01	1.04827
2009-10-01	2.86931
2010-01-01	0.27642
2010-04-01	-0.47984
2010-07-01	-1.17265
2010-10-01	1.34263
2011-01-01	0.87545
2011-04-01	0.39499
2011-07-01	-0.41091
2011-10-01	-1.04079
2012-01-01	2.18176
2012-04-01	0.71685
2012-07-01	-1.25769
2012-10-01	0.26455
2013-01-01	-0.20703
2013-04-01	2.03929
2013-07-01	1.14149
2013-10-01	-0.99889
2014-01-01	5.81859
2014-04-01	3.65395
2014-07-01	-1.35439
2014-10-01	2.07991
2015-01-01	1.05788
2015-04-01	0.25059