Quarter	Billions of US Dollars
1987-01-01	0.05000
1989-10-01	-0.03000
1991-01-01	0.03510
1995-07-01	0.04000
1995-10-01	0.02971
1996-01-01	-0.05242
1996-04-01	0.25218
1996-07-01	0.01652
1996-10-01	0.03943
1997-01-01	0.02500
1997-04-01	0.06551
1997-07-01	0.35961
1997-10-01	0.05547
1998-01-01	0.06984
1998-04-01	0.98300
1998-07-01	-0.00624
1998-10-01	0.05567
1999-01-01	0.81347
1999-04-01	-0.16763
1999-07-01	-0.14946
1999-10-01	0.22781
2000-01-01	0.09221
2000-04-01	0.11506
2000-07-01	-0.09253
2000-10-01	-0.00953
2001-01-01	0.00112
2001-04-01	-0.12366
2001-07-01	0.11883
2001-10-01	-0.12301
2002-01-01	-0.01515
2002-04-01	-0.47238
2002-07-01	0.17707
2002-10-01	0.21520
2003-01-01	0.03389
2003-04-01	0.11626
2003-07-01	0.19956
2003-10-01	0.47690
2004-01-01	0.35640
2004-04-01	0.55536
2004-07-01	1.10331
2004-10-01	0.47209
2005-01-01	0.40336
2005-04-01	0.38361
2005-07-01	2.03741
2005-10-01	1.31960
2006-01-01	0.45517
2006-04-01	0.32975
2006-07-01	0.84964
2006-10-01	0.44716
2007-01-01	0.93876
2007-04-01	0.53797
2007-07-01	0.33062
2007-10-01	-0.53667
2008-01-01	-0.43171
2008-04-01	-0.21239
2008-07-01	0.30262
2008-10-01	-0.29398
2009-01-01	-1.36605
2009-04-01	-1.21126
2009-07-01	0.71608
2009-10-01	1.78758
2010-01-01	-0.50880
2010-04-01	-0.04929
2010-07-01	0.93029
2010-10-01	-0.35708
2011-01-01	1.17019
2011-04-01	1.01881
2011-07-01	-0.27142
2011-10-01	0.94865
2012-01-01	1.02115
2012-04-01	0.67760
2012-07-01	3.00894
2012-10-01	1.41996
2013-01-01	0.38055
2013-04-01	0.61669
2013-07-01	-0.31252
2013-10-01	-0.29515
2014-01-01	0.35535
2014-04-01	0.05996
2014-07-01	2.63102
2014-10-01	-1.42198
2015-01-01	0.90004
2015-04-01	0.67599