Quarter	Billions of US Dollars
1972-07-01	0.0500
1973-04-01	0.0300
1974-04-01	0.0515
1975-01-01	0.0600
1975-04-01	0.0805
1975-10-01	0.0189
1976-01-01	0.0250
1976-04-01	0.0408
1976-07-01	0.0172
1977-01-01	0.0300
1977-04-01	0.0200
1977-07-01	0.1433
1977-10-01	0.1106
1978-04-01	0.0467
1979-04-01	0.0963
1980-01-01	-0.0250
1980-04-01	0.0500
1980-07-01	0.0121
1981-01-01	-0.0300
1981-04-01	-0.0920
1982-07-01	-0.0268
1982-10-01	-0.0204
1983-01-01	-0.0600
1983-04-01	-0.0600
1983-07-01	-0.0350
1983-10-01	-0.0172
1984-04-01	-0.0512
1984-07-01	0.0500
1984-10-01	-0.0012
1985-01-01	0.1696
1985-04-01	-0.0220
1985-07-01	0.1525
1985-10-01	-0.0570
1986-01-01	0.1623
1986-04-01	0.3863
1986-07-01	0.0725
1986-10-01	0.1036
1987-01-01	0.3544
1987-04-01	-0.0050
1987-07-01	-0.0026
1987-10-01	0.3911
1988-01-01	0.7657
1988-04-01	0.4550
1988-07-01	0.5409
1988-10-01	0.6679
1989-01-01	0.9200
1989-04-01	0.2933
1989-07-01	1.3031
1989-10-01	0.4971
1990-01-01	0.7502
1990-04-01	0.2679
1990-07-01	0.4583
1990-10-01	0.4597
1991-01-01	0.1285
1991-04-01	0.3207
1991-07-01	0.1000
1991-10-01	1.4165
1992-01-01	0.8190
1992-04-01	0.2822
1992-07-01	1.2523
1992-10-01	0.9133
1993-01-01	2.3165
1993-04-01	1.2725
1993-07-01	2.0029
1993-10-01	2.1943
1994-01-01	1.3601
1994-04-01	0.2934
1994-07-01	5.5774
1994-10-01	6.4711
1995-01-01	-0.8015
1995-04-01	0.3921
1995-07-01	1.7540
1995-10-01	0.7843
1996-01-01	0.4179
1996-04-01	1.9122
1996-07-01	-1.9885
1996-10-01	0.3922
1997-01-01	2.5916
1997-04-01	4.8219
1997-07-01	4.6703
1997-10-01	2.3050
1998-01-01	2.5001
1998-04-01	5.7129
1998-07-01	6.1845
1998-10-01	-1.1244
1999-01-01	1.1629
1999-04-01	0.6843
1999-07-01	-0.0456
1999-10-01	3.9258
2000-01-01	2.3387
2000-04-01	2.9473
2000-07-01	20.9273
2000-10-01	-0.6056
2001-01-01	1.7869
2001-04-01	0.4204
2001-07-01	-0.0428
2001-10-01	1.2509
2002-01-01	1.1389
2002-04-01	0.2966
2002-07-01	0.7594
2002-10-01	1.1659
2003-01-01	5.2228
2003-04-01	0.8882
2003-07-01	4.3471
2003-10-01	2.8785
2004-01-01	3.6513
2004-04-01	7.9580
2004-07-01	4.3232
2004-10-01	4.9558
2005-01-01	11.1315
2005-04-01	16.7803
2005-07-01	1.0619
2005-10-01	10.3315
2006-01-01	12.0953
2006-04-01	2.4879
2006-07-01	8.2546
2006-10-01	21.3803
2007-01-01	16.2410
2007-04-01	17.7959
2007-07-01	1.6348
2007-10-01	11.7383
2008-01-01	-1.8661
2008-04-01	22.6641
2008-07-01	5.5039
2008-10-01	-4.3708
2009-01-01	-2.1440
2009-04-01	7.1826
2009-07-01	5.0777
2009-10-01	7.9787
2010-01-01	9.8522
2010-04-01	8.1952
2010-07-01	17.7369
2010-10-01	18.5066
2011-01-01	14.6294
2011-04-01	14.2239
2011-07-01	-0.6843
2011-10-01	1.2283
2012-01-01	15.6817
2012-04-01	24.9764
2012-07-01	40.3062
2012-10-01	39.6722
2013-01-01	15.4688
2013-04-01	21.4155
2013-07-01	9.9795
2013-10-01	26.9297
2014-01-01	-8.1300
2014-04-01	-2.3249
2014-07-01	1.1752
2014-10-01	6.0908
2015-01-01	-2.3697
2015-04-01	-0.1175