Quarter	Billions of US Dollars
1987-01-01	0.07396
1987-04-01	0.03986
1987-07-01	0.91061
1987-10-01	-0.03716
1988-01-01	0.69980
1988-04-01	0.27180
1988-07-01	0.30581
1988-10-01	-0.00625
1989-01-01	0.08000
1989-04-01	0.17183
1989-07-01	0.87099
1989-10-01	1.22427
1990-01-01	0.15725
1990-04-01	0.97950
1990-07-01	0.64003
1990-10-01	1.21713
1991-01-01	0.17854
1991-04-01	-0.06054
1991-07-01	0.21776
1991-10-01	0.39800
1992-01-01	-0.12996
1992-04-01	0.30969
1992-07-01	-0.63014
1992-10-01	-0.11854
1993-01-01	-0.11051
1993-04-01	0.23898
1993-07-01	0.37767
1993-10-01	-1.00783
1994-01-01	-0.17691
1994-04-01	0.11826
1994-07-01	-1.31475
1994-10-01	0.00663
1995-01-01	0.20475
1995-04-01	0.29486
1995-07-01	-0.08105
1995-10-01	0.24435
1996-01-01	0.29479
1996-04-01	0.14539
1996-07-01	0.36507
1996-10-01	0.09780
1997-01-01	0.22290
1997-04-01	0.52781
1997-07-01	-0.12835
1997-10-01	0.23014
1998-01-01	0.21800
1998-04-01	0.31626
1998-07-01	-0.25098
1998-10-01	0.02263
1999-01-01	0.49867
1999-04-01	0.75578
1999-07-01	1.05359
1999-10-01	0.96339
2000-01-01	0.40949
2000-04-01	1.69572
2000-07-01	0.89979
2000-10-01	-0.85989
2001-01-01	1.15582
2001-04-01	1.59359
2001-07-01	-0.58791
2001-10-01	1.49190
2002-01-01	1.46073
2002-04-01	0.81996
2002-07-01	0.81383
2002-10-01	0.51799
2003-01-01	1.17320
2003-04-01	-0.14842
2003-07-01	0.30898
2003-10-01	1.58368
2004-01-01	1.59948
2004-04-01	2.37921
2004-07-01	-0.38159
2004-10-01	-0.03528
2005-01-01	0.12795
2005-04-01	0.96867
2005-07-01	2.39313
2005-10-01	-1.36818
2006-01-01	-0.07627
2006-04-01	0.78160
2006-07-01	-0.16536
2006-10-01	2.23813
2007-01-01	-0.12882
2007-04-01	1.88296
2007-07-01	2.14996
2007-10-01	2.73530
2008-01-01	0.37737
2008-04-01	0.46063
2008-07-01	0.36975
2008-10-01	-0.91437
2009-01-01	-2.52877
2009-04-01	0.96209
2009-07-01	-0.46513
2009-10-01	3.15318
2010-01-01	1.58552
2010-04-01	0.60919
2010-07-01	-0.22611
2010-10-01	-0.14770
2011-01-01	2.42967
2011-04-01	-1.72063
2011-07-01	1.06473
2011-10-01	-1.92211
2012-01-01	0.34806
2012-04-01	-2.64505
2012-07-01	-1.49463
2012-10-01	-2.05115
2013-01-01	1.43087
2013-04-01	-0.40995
2013-07-01	1.53329
2013-10-01	-0.89389
2014-01-01	0.03835
2014-04-01	-1.55805
2014-07-01	0.79186
2014-10-01	4.06123
2015-01-01	-0.46293
2015-04-01	-2.08526