Quarter	Billions of US Dollars
1987-01-01	0.219
1987-04-01	-0.021
1987-07-01	-0.098
1987-10-01	0.536
1988-01-01	0.604
1988-04-01	0.430
1988-07-01	1.266
1988-10-01	0.093
1989-01-01	0.621
1989-04-01	0.148
1989-07-01	2.992
1989-10-01	1.681
1990-01-01	1.066
1990-04-01	0.158
1990-07-01	0.068
1990-10-01	0.980
1991-01-01	0.363
1991-04-01	1.541
1991-07-01	0.518
1991-10-01	0.103
1992-01-01	0.302
1992-04-01	0.309
1992-07-01	-0.390
1992-10-01	-0.068
1993-01-01	0.219
1993-04-01	2.171
1993-07-01	4.117
1993-10-01	2.124
1994-01-01	3.721
1994-04-01	1.672
1994-07-01	2.218
1994-10-01	0.936
1995-01-01	2.464
1995-04-01	0.742
1995-07-01	2.722
1995-10-01	2.053
1996-01-01	1.044
1996-04-01	1.432
1996-07-01	4.103
1996-10-01	4.676
1997-01-01	3.285
1997-04-01	4.857
1997-07-01	4.816
1997-10-01	0.822
1998-01-01	5.784
1998-04-01	1.700
1998-07-01	4.184
1998-10-01	0.013
1999-01-01	5.942
1999-04-01	5.604
1999-07-01	16.825
1999-10-01	6.136
2000-01-01	16.964
2000-04-01	6.113
2000-07-01	8.815
2000-10-01	8.740
2001-01-01	-0.254
2001-04-01	5.346
2001-07-01	7.184
2001-10-01	5.475
2002-01-01	5.954
2002-04-01	10.348
2002-07-01	12.613
2002-10-01	8.064
2003-01-01	24.760
2003-04-01	23.526
2003-07-01	23.147
2003-10-01	24.404
2004-01-01	19.140
2004-04-01	20.572
2004-07-01	19.524
2004-10-01	28.047
2005-01-01	27.077
2005-04-01	28.615
2005-07-01	30.347
2005-10-01	18.137
2006-01-01	28.518
2006-04-01	14.847
2006-07-01	20.188
2006-10-01	56.334
2007-01-01	39.657
2007-04-01	47.728
2007-07-01	56.940
2007-10-01	42.671
2008-01-01	27.629
2008-04-01	124.226
2008-07-01	58.784
2008-10-01	175.695
2009-01-01	18.687
2009-04-01	29.695
2009-07-01	66.158
2009-10-01	-13.491
2010-01-01	33.410
2010-04-01	-13.278
2010-07-01	36.826
2010-10-01	-41.156
2011-01-01	19.081
2011-04-01	12.759
2011-07-01	-7.830
2011-10-01	-77.852
2012-01-01	9.438
2012-04-01	-27.533
2012-07-01	-47.665
2012-10-01	-33.303
2013-01-01	-19.403
2013-04-01	-50.504
2013-07-01	-17.064
2013-10-01	-7.160
2014-01-01	-21.978
2014-04-01	-18.327
2014-07-01	-13.845
2014-10-01	-24.139
2015-01-01	-20.994
2015-04-01	-0.965