Quarter	Billions of US Dollars
1972-01-01	0.04900
1972-04-01	0.07780
1972-07-01	0.02970
1972-10-01	0.08580
1973-04-01	0.13550
1973-07-01	0.03780
1973-10-01	0.29490
1974-01-01	0.09370
1974-04-01	0.36320
1974-07-01	0.03040
1974-10-01	0.07240
1975-01-01	0.06400
1975-04-01	0.05750
1975-07-01	0.04550
1976-01-01	0.06080
1976-04-01	0.05590
1976-07-01	0.06690
1976-10-01	0.16690
1977-01-01	0.11710
1977-04-01	0.05170
1977-07-01	0.10340
1977-10-01	0.06780
1978-01-01	0.06450
1978-04-01	0.12860
1978-07-01	0.06240
1978-10-01	0.17000
1979-01-01	0.11000
1979-04-01	0.07500
1979-10-01	0.01500
1980-07-01	0.09000
1980-10-01	0.04000
1981-01-01	0.00700
1981-04-01	0.01500
1981-07-01	0.08000
1982-04-01	0.07500
1983-04-01	0.02500
1983-07-01	0.06000
1983-10-01	-0.11000
1984-01-01	-0.11000
1984-04-01	-0.00780
1984-07-01	-0.03000
1984-10-01	-0.01500
1985-04-01	-0.13550
1985-07-01	-0.08780
1985-10-01	-0.34290
1986-01-01	-0.10070
1986-04-01	-0.07820
1986-07-01	0.02460
1986-10-01	-0.12690
1987-01-01	-0.09300
1987-04-01	-0.14250
1987-07-01	-0.11020
1987-10-01	-0.08580
1988-01-01	-0.06080
1988-04-01	-0.13090
1988-07-01	-0.09690
1988-10-01	-0.07810
1989-01-01	-0.11710
1989-04-01	-0.17560
1989-10-01	-0.06780
1990-01-01	-0.06450
1990-04-01	-0.07860
1990-07-01	-0.14240
1990-10-01	-0.05200
1991-04-01	0.94900
1993-07-01	0.05000
1994-01-01	-0.02000
1994-04-01	-0.30000
1994-07-01	-0.01500
1995-10-01	0.11120
1996-07-01	-0.10500
1996-10-01	0.80000
1997-04-01	0.07500
1997-07-01	0.28813
1997-10-01	0.90000
1998-04-01	0.11126
1998-07-01	0.36395
1998-10-01	0.50000
1999-01-01	0.80000
1999-04-01	0.42269
1999-07-01	0.06000
1999-10-01	0.76315
2000-01-01	1.02926
2000-04-01	0.19413
2000-07-01	0.44635
2000-10-01	0.10003
2001-01-01	0.26231
2001-04-01	0.69999
2001-07-01	0.36000
2001-10-01	0.15017
2002-01-01	0.59572
2002-04-01	0.03226
2002-07-01	0.04559
2002-10-01	0.45005
2003-01-01	0.20060
2003-04-01	0.95098
2003-07-01	0.13619
2003-10-01	0.76469
2004-01-01	1.29309
2004-04-01	1.00519
2004-07-01	-0.00333
2004-10-01	0.54282
2005-01-01	-0.39358
2005-04-01	-0.32774
2005-07-01	-0.47637
2005-10-01	0.76619
2006-01-01	0.88264
2006-04-01	-0.68874
2006-07-01	0.00065
2006-10-01	0.31632
2007-01-01	-0.30121
2007-04-01	0.16379
2007-07-01	-0.58197
2007-10-01	-0.19435
2008-01-01	0.15934
2008-04-01	1.93018
2008-07-01	0.09080
2008-10-01	-0.02230
2009-01-01	0.68209
2009-04-01	-0.07689
2009-07-01	0.06079
2009-10-01	-0.59524
2010-01-01	1.58650
2010-04-01	1.69445
2010-07-01	-0.19047
2010-10-01	0.10388
2011-01-01	-0.15345
2011-04-01	-0.33484
2011-07-01	0.10850
2011-10-01	4.84967
2012-01-01	2.15866
2012-04-01	1.03860
2012-07-01	0.00647
2012-10-01	4.85439
2013-01-01	1.09200
2013-04-01	-1.94227
2013-07-01	0.67763
2013-10-01	-0.37637
2014-01-01	1.57892
2014-04-01	1.51517
2014-07-01	0.02492
2014-10-01	3.35371
2015-01-01	5.16679
2015-04-01	-0.99408