Quarter	Billions of US Dollars
1988-01-01	-0.07813
1988-10-01	-0.05000
1989-01-01	-0.07164
1989-04-01	0.10000
1989-10-01	-0.01500
1990-04-01	-0.09647
1990-07-01	-0.05000
1990-10-01	-0.02500
1991-01-01	0.02000
1991-04-01	0.05000
1991-07-01	0.10000
1991-10-01	0.05320
1992-01-01	0.09710
1992-04-01	-0.15000
1992-07-01	-0.08500
1992-10-01	0.05000
1993-04-01	0.35510
1993-07-01	3.71355
1993-10-01	-0.08735
1994-01-01	1.60017
1994-04-01	0.67234
1994-07-01	-0.29541
1994-10-01	-0.95811
1995-01-01	-1.80775
1995-04-01	-0.03952
1995-07-01	0.27601
1995-10-01	-0.44010
1996-01-01	0.05905
1996-04-01	-0.02489
1996-07-01	-0.07682
1996-10-01	-0.16503
1997-01-01	-0.50149
1997-04-01	-0.83558
1997-07-01	0.42595
1997-10-01	-0.46594
1998-01-01	-0.00726
1998-04-01	-0.22406
1998-07-01	-0.07532
1998-10-01	-0.29184
1999-01-01	0.18764
1999-04-01	-0.15643
1999-07-01	-0.02978
1999-10-01	-0.03568
2000-01-01	-0.07334
2000-04-01	-0.22424
2000-07-01	-0.37668
2000-10-01	1.29358
2001-01-01	0.36391
2001-04-01	0.53791
2001-07-01	-2.28772
2001-10-01	0.00421
2002-01-01	-0.03848
2002-04-01	-0.00934
2002-07-01	-0.31765
2002-10-01	0.19310
2003-01-01	0.00251
2003-04-01	0.00400
2003-07-01	-0.19096
2003-10-01	-0.19985
2004-01-01	-0.15788
2004-04-01	0.16276
2004-07-01	0.01548
2004-10-01	0.20968
2005-01-01	-0.20620
2005-04-01	0.18862
2005-07-01	-0.11332
2005-10-01	-0.12358
2006-01-01	0.10268
2006-04-01	-0.11358
2006-07-01	-0.02022
2006-10-01	0.44965
2007-01-01	0.29906
2007-04-01	0.03680
2007-07-01	0.14532
2007-10-01	-0.20307
2008-01-01	-0.08376
2008-04-01	0.00511
2008-07-01	-0.04251
2008-10-01	0.22235
2009-01-01	-0.44254
2009-04-01	-0.06150
2009-07-01	0.08190
2009-10-01	-0.08902
2010-01-01	0.14430
2010-04-01	-0.07075
2010-07-01	0.47867
2010-10-01	-0.02662
2011-01-01	-0.11719
2011-04-01	0.05163
2011-07-01	0.25103
2011-10-01	-0.46109
2012-01-01	-0.01915
2012-04-01	0.23062
2012-07-01	-0.10339
2012-10-01	0.09713
2013-01-01	0.04211
2013-04-01	0.15046
2013-07-01	-0.15633
2013-10-01	-0.04256
2014-01-01	0.36225
2014-04-01	0.89846
2014-07-01	-0.18502
2014-10-01	-0.08115
2015-01-01	-0.27387
2015-04-01	0.95722