Quarter	Billions of US Dollars
1987-01-01	0.03397
1987-04-01	0.03717
1987-07-01	0.10400
1987-10-01	-0.00553
1988-01-01	0.25925
1988-04-01	0.09638
1988-07-01	0.18183
1988-10-01	0.49312
1989-01-01	0.42174
1989-04-01	0.45923
1989-07-01	0.01960
1989-10-01	-0.08279
1990-01-01	0.06247
1990-04-01	0.58937
1990-07-01	0.29595
1990-10-01	0.61835
1991-01-01	0.29600
1991-04-01	0.17897
1991-07-01	0.51789
1991-10-01	-0.21303
1992-01-01	-0.20187
1992-04-01	0.64683
1992-07-01	-0.02082
1992-10-01	0.45798
1993-01-01	-0.15435
1993-04-01	-0.31619
1993-07-01	0.89938
1993-10-01	-0.53595
1994-01-01	0.73702
1994-04-01	-0.53684
1994-07-01	0.14948
1994-10-01	0.31915
1995-01-01	-0.56832
1995-04-01	-0.72098
1995-07-01	0.44582
1995-10-01	-0.76066
1996-01-01	0.78579
1996-04-01	1.00984
1996-07-01	-0.44285
1996-10-01	1.03432
1997-01-01	1.55773
1997-04-01	0.21741
1997-07-01	-0.21176
1997-10-01	0.78723
1998-01-01	-0.89773
1998-04-01	-0.75466
1998-07-01	-0.25470
1998-10-01	-0.09319
1999-01-01	-1.03080
1999-04-01	0.09307
1999-07-01	0.25290
1999-10-01	-0.32303
2000-01-01	-0.90780
2000-04-01	0.22535
2000-07-01	-0.13428
2000-10-01	-0.52846
2001-01-01	-0.62442
2001-04-01	-0.05310
2001-07-01	-0.48765
2001-10-01	-0.03305
2002-01-01	0.12461
2002-04-01	0.06154
2002-07-01	-0.30317
2002-10-01	-0.15595
2003-01-01	0.01869
2003-04-01	0.70503
2003-07-01	-0.31143
2003-10-01	0.16216
2004-01-01	0.75768
2004-04-01	1.77334
2004-07-01	0.47375
2004-10-01	0.81070
2005-01-01	0.87201
2005-04-01	0.30531
2005-07-01	0.58265
2005-10-01	-0.40777
2006-01-01	1.40748
2006-04-01	0.63176
2006-07-01	-0.42305
2006-10-01	0.61226
2007-01-01	-0.44975
2007-04-01	-0.13725
2007-07-01	-0.03623
2007-10-01	-0.54862
2008-01-01	0.43188
2008-04-01	0.18297
2008-07-01	1.24881
2008-10-01	0.61117
2009-01-01	-0.23280
2009-04-01	2.02475
2009-07-01	0.50048
2009-10-01	0.06694
2010-01-01	1.27921
2010-04-01	0.24607
2010-07-01	1.45435
2010-10-01	1.98441
2011-01-01	3.04833
2011-04-01	0.64497
2011-07-01	-1.08323
2011-10-01	1.40650
2012-01-01	1.38087
2012-04-01	3.11073
2012-07-01	0.31197
2012-10-01	0.78504
2013-01-01	3.48998
2013-04-01	2.55869
2013-07-01	2.46619
2013-10-01	4.34612
2014-01-01	0.52510
2014-04-01	4.75695
2014-07-01	2.99568
2014-10-01	-0.59140
2015-01-01	0.15622
2015-04-01	3.84907