Quarter	Billions of US Dollars
1987-01-01	-0.00983
1987-04-01	-0.12500
1987-07-01	-0.01310
1988-01-01	-0.01860
1988-10-01	-0.07000
1989-01-01	-0.03419
1989-10-01	0.25500
1990-04-01	0.01920
1990-07-01	0.00920
1991-01-01	-0.01000
1991-04-01	-0.09500
1992-01-01	0.02120
1993-07-01	-0.00843
1994-04-01	0.16613
1994-10-01	-0.03400
1995-01-01	0.45446
1995-04-01	0.05715
1995-10-01	0.14990
1996-01-01	0.02197
1996-04-01	0.28351
1996-07-01	0.09331
1996-10-01	0.07152
1997-07-01	0.05594
1997-10-01	0.04119
1998-04-01	0.08573
1998-07-01	0.00100
1998-10-01	-0.07619
1999-01-01	0.00104
1999-04-01	-0.00355
1999-07-01	-0.19056
1999-10-01	0.24542
2000-01-01	-0.02950
2000-04-01	0.41004
2000-07-01	0.15948
2000-10-01	2.12392
2001-01-01	0.98356
2001-04-01	0.48837
2001-07-01	1.55790
2001-10-01	3.88054
2002-01-01	1.05799
2002-04-01	2.63317
2002-07-01	1.10935
2002-10-01	2.06257
2003-01-01	1.17654
2003-04-01	0.78797
2003-07-01	1.80644
2003-10-01	4.30099
2004-01-01	1.20042
2004-04-01	2.15538
2004-07-01	0.87981
2004-10-01	2.45301
2005-01-01	1.66271
2005-04-01	3.31013
2005-07-01	3.92976
2005-10-01	4.65783
2006-01-01	1.62163
2006-04-01	4.81708
2006-07-01	9.62821
2006-10-01	1.14378
2007-01-01	-4.89897
2007-04-01	-1.48723
2007-07-01	0.98525
2007-10-01	-0.44985
2008-01-01	1.21925
2008-04-01	1.79189
2008-07-01	-0.34798
2008-10-01	5.68898
2009-01-01	-7.81952
2009-04-01	-3.86660
2009-07-01	-2.14754
2009-10-01	-2.52389
2010-01-01	-2.84042
2010-04-01	-4.26302
2010-07-01	-1.68782
2010-10-01	-1.29342
2011-01-01	-1.57812
2011-04-01	-0.35736
2011-07-01	-1.81170
2011-10-01	1.21054
2012-01-01	-1.28819
2012-04-01	-2.45557
2012-07-01	-3.98989
2012-10-01	-2.76209
2013-01-01	3.39315
2013-04-01	9.28868
2013-07-01	4.65096
2013-10-01	7.71324
2014-01-01	7.66052
2014-04-01	3.38264
2014-07-01	5.12163
2014-10-01	2.91349
2015-01-01	8.20273
2015-04-01	7.90811