Quarter	Billions of US Dollars
1972-04-01	0.02520
1973-01-01	0.03000
1973-04-01	0.01720
1976-04-01	0.00340
1976-07-01	0.00680
1977-07-01	0.04300
1978-04-01	0.06770
1978-10-01	0.05200
1979-01-01	0.10280
1979-07-01	0.04960
1980-04-01	-0.02512
1981-04-01	-0.00360
1982-01-01	0.31450
1982-04-01	0.04000
1982-10-01	0.30000
1983-01-01	0.06240
1983-04-01	0.21190
1983-07-01	0.85000
1983-10-01	0.10740
1984-01-01	0.32000
1984-04-01	0.00587
1984-07-01	0.15300
1984-10-01	0.60000
1985-04-01	0.84580
1985-07-01	0.01160
1985-10-01	1.05960
1986-10-01	0.04350
1987-04-01	0.08230
1987-07-01	0.08380
1987-10-01	-0.03675
1988-01-01	0.20300
1988-04-01	-0.32890
1988-07-01	0.05891
1988-10-01	-0.00175
1989-01-01	0.12390
1989-04-01	-0.26000
1989-07-01	-0.10542
1989-10-01	0.15331
1990-04-01	-0.00277
1990-07-01	0.20000
1990-10-01	-0.15193
1991-04-01	0.21815
1992-01-01	-0.11680
1992-04-01	-0.04963
1992-10-01	-1.07434
1993-07-01	-0.70000
1993-10-01	0.15390
1994-04-01	0.09210
1994-07-01	-0.21031
1994-10-01	0.16000
1995-04-01	-0.49857
1995-07-01	1.55000
1995-10-01	0.35000
1996-01-01	0.32638
1996-04-01	0.30430
1996-07-01	0.11500
1996-10-01	1.96000
1997-01-01	0.37940
1997-04-01	2.09868
1997-07-01	0.66113
1997-10-01	0.38983
1998-01-01	-0.51160
1998-04-01	0.00712
1998-07-01	-0.16073
1998-10-01	0.00744
1999-01-01	0.88990
1999-04-01	0.87277
1999-07-01	0.64294
1999-10-01	-0.07589
2000-01-01	-0.13871
2000-04-01	0.09565
2000-07-01	0.28865
2000-10-01	0.97953
2001-01-01	0.15201
2001-04-01	0.64400
2001-07-01	1.09693
2001-10-01	0.03780
2002-01-01	1.18002
2002-04-01	2.48107
2002-07-01	0.40529
2002-10-01	1.13617
2003-01-01	-0.08184
2003-04-01	0.03543
2003-07-01	-0.76610
2003-10-01	0.26747
2004-01-01	1.65834
2004-04-01	0.14037
2004-07-01	1.77154
2004-10-01	1.54713
2005-01-01	0.00914
2005-04-01	1.27851
2005-07-01	0.50374
2005-10-01	-0.80221
2006-01-01	1.21180
2006-04-01	0.12472
2006-07-01	0.64742
2006-10-01	0.64108
2007-01-01	0.26780
2007-04-01	-0.54647
2007-07-01	0.10882
2007-10-01	0.20656
2008-01-01	0.92993
2008-04-01	-0.32218
2008-07-01	0.63402
2008-10-01	-0.54693
2009-01-01	-0.66128
2009-04-01	-2.43057
2009-07-01	4.26106
2009-10-01	-0.97679
2010-01-01	0.95668
2010-04-01	1.75903
2010-07-01	2.26914
2010-10-01	0.61723
2011-01-01	0.14852
2011-04-01	0.46029
2011-07-01	0.41765
2011-10-01	0.09628
2012-01-01	4.09777
2012-04-01	3.38154
2012-07-01	2.24059
2012-10-01	0.14074
2013-01-01	0.14470
2013-04-01	3.46782
2013-07-01	-0.05279
2013-10-01	2.22259
2014-01-01	0.43142
2014-04-01	0.72980
2014-07-01	-0.77218
2014-10-01	2.62963
2015-01-01	4.28137
2015-04-01	0.93436