Quarter	Billions of US Dollars
1987-01-01	0.32712
1987-04-01	0.32510
1987-07-01	1.35102
1987-10-01	0.34458
1988-01-01	1.26796
1988-04-01	1.02335
1988-07-01	0.94473
1988-10-01	1.13980
1989-01-01	0.77988
1989-04-01	1.13072
1989-07-01	1.38244
1989-10-01	2.36634
1990-01-01	1.74597
1990-04-01	1.35748
1990-07-01	2.49908
1990-10-01	2.88399
1991-01-01	1.09870
1991-04-01	0.99499
1991-07-01	0.56934
1991-10-01	0.53838
1992-01-01	0.72682
1992-04-01	1.12014
1992-07-01	1.64076
1992-10-01	-0.38743
1993-01-01	-0.79419
1993-04-01	-0.42885
1993-07-01	7.91436
1993-10-01	0.40582
1994-01-01	-0.50721
1994-04-01	4.59326
1994-07-01	4.30232
1994-10-01	1.87081
1995-01-01	1.19712
1995-04-01	4.16850
1995-07-01	0.73482
1995-10-01	4.10270
1996-01-01	4.33709
1996-04-01	4.21591
1996-07-01	5.61286
1996-10-01	6.22689
1997-01-01	4.06842
1997-04-01	4.34983
1997-07-01	9.41232
1997-10-01	-1.18799
1998-01-01	3.24182
1998-04-01	4.47923
1998-07-01	-0.71049
1998-10-01	1.48521
1999-01-01	2.25477
1999-04-01	2.56711
1999-07-01	8.15608
1999-10-01	0.00522
2000-01-01	-3.07137
2000-04-01	1.96865
2000-07-01	-4.03870
2000-10-01	-1.42154
2001-01-01	0.21254
2001-04-01	1.32405
2001-07-01	-0.68292
2001-10-01	-0.68664
2002-01-01	-2.65991
2002-04-01	-1.00285
2002-07-01	1.29832
2002-10-01	1.73511
2003-01-01	1.05794
2003-04-01	-2.59178
2003-07-01	0.10428
2003-10-01	2.97665
2004-01-01	4.79252
2004-04-01	2.81738
2004-07-01	-2.50343
2004-10-01	-3.09428
2005-01-01	3.47659
2005-04-01	-1.66735
2005-07-01	-0.09046
2005-10-01	-4.13169
2006-01-01	5.30222
2006-04-01	5.48960
2006-07-01	1.99230
2006-10-01	6.66025
2007-01-01	7.74006
2007-04-01	4.24151
2007-07-01	1.04148
2007-10-01	7.08255
2008-01-01	0.25562
2008-04-01	5.51954
2008-07-01	2.31956
2008-10-01	1.83613
2009-01-01	2.31942
2009-04-01	-3.04250
2009-07-01	0.40793
2009-10-01	-2.21503
2010-01-01	-4.59730
2010-04-01	-8.43677
2010-07-01	0.88235
2010-10-01	-2.59248
2011-01-01	-1.68744
2011-04-01	-7.46536
2011-07-01	-1.38003
2011-10-01	-2.67175
2012-01-01	-4.55120
2012-04-01	-1.91909
2012-07-01	4.41771
2012-10-01	-3.02474
2013-01-01	3.53658
2013-04-01	-0.94773
2013-07-01	0.34109
2013-10-01	4.58308
2014-01-01	3.12579
2014-04-01	-5.17157
2014-07-01	3.83984
2014-10-01	7.15731
2015-01-01	2.07128
2015-04-01	-1.06000