Quarter	Billions of US Dollars
1987-01-01	0.43645
1987-04-01	0.30893
1987-07-01	-0.09654
1987-10-01	0.14612
1988-01-01	0.14917
1988-04-01	0.35060
1988-07-01	0.44459
1988-10-01	0.70884
1989-01-01	1.03919
1989-04-01	0.27064
1989-07-01	0.27214
1989-10-01	0.98089
1990-01-01	0.93867
1990-04-01	0.89205
1990-07-01	0.98032
1990-10-01	0.44288
1991-01-01	-0.20586
1991-04-01	1.18204
1991-07-01	-0.17931
1991-10-01	-0.53449
1992-01-01	-0.65942
1992-04-01	-0.70510
1992-07-01	0.02111
1992-10-01	-0.90086
1993-01-01	-1.24477
1993-04-01	-0.63312
1993-07-01	1.11970
1993-10-01	-0.12762
1994-01-01	-0.50069
1994-04-01	-0.51759
1994-07-01	0.38229
1994-10-01	-0.74277
1995-01-01	-0.32367
1995-04-01	-0.42847
1995-07-01	-0.17500
1995-10-01	-0.16178
1996-01-01	-1.15553
1996-04-01	-1.33498
1996-07-01	-0.57414
1996-10-01	0.12272
1997-01-01	-0.52713
1997-04-01	-0.53798
1997-07-01	0.20244
1997-10-01	-0.11862
1998-01-01	-0.28644
1998-04-01	-0.25064
1998-07-01	0.09297
1998-10-01	-0.58020
1999-01-01	0.11251
1999-04-01	0.27142
1999-07-01	1.61027
1999-10-01	-0.59660
2000-01-01	0.03083
2000-04-01	-0.10220
2000-07-01	-0.14495
2000-10-01	0.25968
2001-01-01	0.26244
2001-04-01	0.25555
2001-07-01	-0.13081
2001-10-01	-0.02801
2002-01-01	0.08210
2002-04-01	-0.49698
2002-07-01	1.14420
2002-10-01	1.09389
2003-01-01	0.31620
2003-04-01	-1.05967
2003-07-01	0.23804
2003-10-01	-0.05299
2004-01-01	2.43422
2004-04-01	0.94421
2004-07-01	-1.63166
2004-10-01	3.63334
2005-01-01	0.52136
2005-04-01	0.41194
2005-07-01	1.60404
2005-10-01	2.82586
2006-01-01	3.58241
2006-04-01	0.16807
2006-07-01	0.99457
2006-10-01	-0.00400
2007-01-01	1.38865
2007-04-01	3.53144
2007-07-01	-1.03163
2007-10-01	-1.86672
2008-01-01	-2.26313
2008-04-01	3.88728
2008-07-01	2.50595
2008-10-01	0.87984
2009-01-01	0.11071
2009-04-01	1.96937
2009-07-01	1.64559
2009-10-01	2.24707
2010-01-01	0.65339
2010-04-01	-1.98224
2010-07-01	-0.61999
2010-10-01	5.31367
2011-01-01	-0.11556
2011-04-01	6.44228
2011-07-01	2.68715
2011-10-01	-0.01965
2012-01-01	4.37213
2012-04-01	4.35310
2012-07-01	0.59760
2012-10-01	-2.55159
2013-01-01	2.39004
2013-04-01	2.20048
2013-07-01	1.31139
2013-10-01	-1.21656
2014-01-01	7.87616
2014-04-01	1.58439
2014-07-01	-1.76956
2014-10-01	3.53087
2015-01-01	2.26811
2015-04-01	-0.06079