Quarter	Billions of US Dollars
1987-01-01	0.02000
1987-07-01	0.00084
1987-10-01	-0.03133
1988-01-01	0.13420
1988-04-01	-0.00645
1988-07-01	-0.03990
1988-10-01	-0.03392
1989-04-01	-0.06000
1989-07-01	0.07470
1990-01-01	-0.04436
1990-04-01	-0.09081
1990-07-01	-0.03742
1990-10-01	-0.01200
1991-01-01	-0.06533
1991-07-01	-0.02867
1992-04-01	-0.00017
1993-01-01	-0.06611
1993-07-01	0.05000
1994-01-01	0.17080
1994-07-01	0.24898
1994-10-01	0.11500
1995-01-01	0.40900
1995-04-01	0.04815
1995-07-01	0.34420
1995-10-01	0.10000
1996-01-01	0.25000
1996-07-01	0.13718
1996-10-01	0.25587
1997-04-01	0.14644
1997-07-01	0.60904
1997-10-01	0.17956
1998-01-01	0.01854
1998-04-01	0.27331
1998-07-01	0.14996
1998-10-01	-0.02856
1999-01-01	0.28171
1999-04-01	-0.04024
1999-07-01	0.39553
1999-10-01	0.36829
2000-01-01	0.38207
2000-04-01	0.07634
2000-07-01	0.86859
2000-10-01	0.20724
2001-01-01	0.21630
2001-04-01	0.38023
2001-07-01	0.66319
2001-10-01	0.45206
2002-01-01	-0.09552
2002-04-01	1.82860
2002-07-01	0.28749
2002-10-01	1.70908
2003-01-01	1.29723
2003-04-01	0.02728
2003-07-01	2.45691
2003-10-01	0.45988
2004-01-01	2.94002
2004-04-01	-0.03471
2004-07-01	0.71349
2004-10-01	1.30191
2005-01-01	0.93880
2005-04-01	2.05201
2005-07-01	0.81370
2005-10-01	1.26021
2006-01-01	4.50180
2006-04-01	1.80629
2006-07-01	1.11953
2006-10-01	7.79014
2007-01-01	4.48374
2007-04-01	3.89629
2007-07-01	3.82597
2007-10-01	4.11838
2008-01-01	-5.04544
2008-04-01	3.26449
2008-07-01	3.65512
2008-10-01	0.35140
2009-01-01	-1.44799
2009-04-01	6.78474
2009-07-01	2.34685
2009-10-01	0.79082
2010-01-01	-0.16058
2010-04-01	-0.56810
2010-07-01	8.49891
2010-10-01	9.09227
2011-01-01	4.71360
2011-04-01	1.76999
2011-07-01	-1.37539
2011-10-01	5.96730
2012-01-01	0.91193
2012-04-01	-1.19099
2012-07-01	1.94135
2012-10-01	8.43901
2013-01-01	5.87142
2013-04-01	0.12284
2013-07-01	2.57898
2013-10-01	7.17823
2014-01-01	-0.33840
2014-04-01	0.73113
2014-07-01	2.68463
2014-10-01	-0.36023
2015-01-01	9.11837
2015-04-01	1.97593