Quarter	Billions of US Dollars
1987-10-01	0.00840
1988-01-01	-0.05819
1988-04-01	-0.07500
1989-01-01	0.05000
1989-04-01	-0.05000
1989-07-01	-0.03767
1989-10-01	-0.13791
1990-07-01	0.03758
1990-10-01	0.04440
1991-01-01	-0.05000
1991-07-01	-0.05000
1992-07-01	0.01073
1992-10-01	0.53519
1993-10-01	-0.02851
1994-01-01	0.01000
1994-04-01	0.25995
1994-07-01	0.03309
1994-10-01	-0.02531
1995-01-01	0.14149
1995-04-01	0.03296
1995-07-01	0.44009
1995-10-01	-0.12990
1996-01-01	0.18476
1996-04-01	0.37564
1996-07-01	-0.35373
1996-10-01	-0.70863
1997-07-01	0.15575
1997-10-01	0.09015
1998-01-01	0.00935
1998-04-01	-0.00472
1998-07-01	0.31629
1998-10-01	0.00015
1999-01-01	0.10126
1999-04-01	-0.07170
1999-07-01	0.90963
1999-10-01	-0.24010
2000-01-01	0.73976
2000-04-01	0.00453
2000-07-01	-0.27075
2000-10-01	0.45233
2001-01-01	0.06131
2001-04-01	0.12244
2001-07-01	0.67581
2001-10-01	-0.55163
2002-01-01	-0.31354
2002-04-01	0.23144
2002-07-01	0.00306
2002-10-01	0.02207
2003-01-01	0.00749
2003-04-01	-0.06641
2003-07-01	-0.29956
2003-10-01	0.60777
2004-01-01	0.99049
2004-04-01	-0.43714
2004-07-01	0.36515
2004-10-01	-0.39066
2005-01-01	0.47296
2005-04-01	0.41629
2005-07-01	0.83598
2005-10-01	-0.67824
2006-01-01	3.59987
2006-04-01	0.44722
2006-07-01	2.66108
2006-10-01	1.23961
2007-01-01	5.25003
2007-04-01	6.61151
2007-07-01	1.83397
2007-10-01	6.55480
2008-01-01	-2.80964
2008-04-01	6.18897
2008-07-01	-4.13591
2008-10-01	-0.52099
2009-01-01	-1.01449
2009-04-01	5.00273
2009-07-01	-2.56278
2009-10-01	-0.34740
2010-01-01	-0.67672
2010-04-01	-5.82578
2010-07-01	-0.12047
2010-10-01	-3.07634
2011-01-01	-0.02457
2011-04-01	-2.47839
2011-07-01	-0.89024
2011-10-01	-0.04110
2012-01-01	-3.68090
2012-04-01	-2.91042
2012-07-01	0.97191
2012-10-01	-0.12975
2013-01-01	1.55205
2013-04-01	0.11765
2013-07-01	1.71664
2013-10-01	1.81596
2014-01-01	2.09940
2014-04-01	-1.32155
2014-07-01	0.16238
2014-10-01	1.58192
2015-01-01	1.79318
2015-04-01	0.36521