Quarter	Billions of US Dollars
1987-01-01	-0.00656
1987-04-01	-0.00668
1987-10-01	-0.00702
1988-01-01	0.02960
1988-07-01	0.00141
1989-07-01	-0.02731
1989-10-01	-0.04519
1990-07-01	-0.00055
1991-04-01	-0.00923
1991-07-01	0.04665
1991-10-01	0.00760
1992-01-01	0.01810
1992-04-01	0.02950
1992-07-01	0.04620
1992-10-01	0.03670
1993-01-01	0.01482
1993-04-01	0.06080
1993-07-01	0.08248
1993-10-01	0.08450
1994-04-01	0.02910
1994-07-01	0.10912
1994-10-01	0.23930
1995-01-01	0.47392
1995-04-01	0.12763
1995-07-01	0.37401
1995-10-01	0.23696
1996-01-01	0.09320
1996-04-01	0.53791
1996-07-01	0.33447
1996-10-01	0.24291
1997-01-01	0.02378
1997-04-01	0.06629
1997-07-01	0.31978
1997-10-01	0.72962
1998-01-01	0.04963
1998-04-01	-0.38352
1998-07-01	0.97103
1998-10-01	0.00674
1999-01-01	-0.40399
1999-04-01	0.17172
1999-07-01	0.53237
1999-10-01	0.63943
2000-01-01	-0.93945
2000-04-01	0.85209
2000-07-01	1.38291
2000-10-01	0.00939
2001-01-01	0.75244
2001-04-01	1.39623
2001-07-01	0.67799
2001-10-01	-1.00676
2002-01-01	0.58079
2002-04-01	1.25275
2002-07-01	-2.62360
2002-10-01	1.44131
2003-01-01	-0.56459
2003-04-01	-0.60966
2003-07-01	0.07244
2003-10-01	1.21733
2004-01-01	-1.05915
2004-04-01	0.09406
2004-07-01	-0.47523
2004-10-01	0.55501
2005-01-01	-0.29913
2005-04-01	0.14161
2005-07-01	0.27422
2005-10-01	-0.44220
2006-01-01	1.09131
2006-04-01	0.66661
2006-07-01	-0.79224
2006-10-01	0.38873
2007-01-01	-0.26177
2007-04-01	-0.04067
2007-07-01	1.73384
2007-10-01	-0.85777
2008-01-01	-1.89556
2008-04-01	0.42705
2008-07-01	-1.06341
2008-10-01	-0.63284
2009-01-01	-1.49478
2009-04-01	-0.45861
2009-07-01	-0.89198
2009-10-01	1.43128
2010-01-01	2.43949
2010-04-01	-0.86103
2010-07-01	-0.07412
2010-10-01	-0.86261
2011-01-01	-0.00662
2011-04-01	1.15502
2011-07-01	0.28040
2011-10-01	0.75816
2012-01-01	0.01504
2012-04-01	-0.17644
2012-07-01	-0.82530
2012-10-01	0.73511
2013-01-01	0.21730
2013-04-01	-1.65388
2013-07-01	-0.84974
2013-10-01	-0.83431
2014-01-01	-0.55167
2014-04-01	2.58318
2014-07-01	0.19351
2014-10-01	-1.54778
2015-01-01	0.84143
2015-04-01	-0.98650