Quarter	Billions of US Dollars
1971-10-01	0.0350
1972-04-01	0.0515
1972-10-01	0.0200
1973-07-01	0.0766
1973-10-01	0.0300
1974-01-01	0.0500
1974-07-01	0.0090
1975-01-01	0.0244
1975-04-01	0.0120
1975-10-01	0.0192
1976-04-01	0.0250
1976-07-01	0.0600
1976-10-01	0.0848
1977-01-01	0.0619
1977-04-01	0.1089
1977-07-01	0.0768
1977-10-01	0.0622
1978-01-01	0.1161
1978-07-01	0.0700
1978-10-01	0.0420
1979-01-01	0.1057
1980-07-01	0.0250
1981-01-01	0.0750
1981-10-01	0.0550
1982-04-01	0.0500
1982-07-01	0.0982
1982-10-01	0.0400
1983-01-01	0.0208
1983-07-01	0.0379
1983-10-01	0.1200
1984-01-01	0.1000
1984-10-01	0.0750
1985-01-01	0.0744
1985-04-01	0.1962
1985-07-01	0.0400
1985-10-01	0.0750
1986-07-01	0.3003
1986-10-01	0.1850
1987-01-01	0.1250
1987-04-01	0.2988
1987-07-01	0.0750
1988-01-01	0.1556
1988-04-01	0.1212
1988-10-01	0.0828
1989-01-01	0.1284
1990-01-01	0.0750
1990-04-01	0.1167
1991-01-01	0.2601
1991-04-01	0.3981
1991-07-01	0.1100
1992-01-01	0.0890
1992-04-01	0.0885
1992-07-01	0.0221
1993-01-01	0.1572
1993-04-01	0.3500
1993-07-01	0.9500
1993-10-01	3.7857
1994-01-01	1.3501
1994-04-01	1.1645
1994-07-01	1.2029
1994-10-01	1.9322
1995-01-01	0.3230
1995-04-01	0.3513
1995-07-01	0.9509
1995-10-01	1.2999
1996-01-01	3.4167
1996-04-01	2.4580
1996-07-01	5.6563
1996-10-01	3.3560
1997-01-01	5.3949
1997-04-01	3.6757
1997-07-01	6.5052
1997-10-01	1.1926
1998-01-01	3.4092
1998-04-01	2.6246
1998-07-01	2.7630
1998-10-01	1.9723
1999-01-01	7.3609
1999-04-01	3.7709
1999-07-01	3.4966
1999-10-01	4.6912
2000-01-01	4.3475
2000-04-01	7.5795
2000-07-01	7.8170
2000-10-01	6.6242
2001-01-01	14.7118
2001-04-01	11.4093
2001-07-01	5.1740
2001-10-01	10.5248
2002-01-01	6.6924
2002-04-01	4.9781
2002-07-01	3.7480
2002-10-01	6.0637
2003-01-01	7.2156
2003-04-01	6.0067
2003-07-01	8.4549
2003-10-01	10.2286
2004-01-01	6.7264
2004-04-01	7.5128
2004-07-01	8.9162
2004-10-01	12.0472
2005-01-01	10.8486
2005-04-01	13.0941
2005-07-01	10.3386
2005-10-01	11.7306
2006-01-01	8.2428
2006-04-01	15.7994
2006-07-01	9.2843
2006-10-01	9.5099
2007-01-01	8.5501
2007-04-01	16.9765
2007-07-01	6.8876
2007-10-01	6.6640
2008-01-01	15.0665
2008-04-01	11.8552
2008-07-01	6.8427
2008-10-01	1.3357
2009-01-01	8.6302
2009-04-01	19.8438
2009-07-01	9.6753
2009-10-01	12.8255
2010-01-01	12.9637
2010-04-01	4.4867
2010-07-01	11.2022
2010-10-01	10.7569
2011-01-01	6.7402
2011-04-01	10.5981
2011-07-01	7.7878
2011-10-01	13.5321
2012-01-01	25.9476
2012-04-01	19.5295
2012-07-01	15.5539
2012-10-01	17.5869
2013-01-01	15.5968
2013-04-01	16.9757
2013-07-01	8.8499
2013-10-01	6.3862
2014-01-01	11.5690
2014-04-01	15.7142
2014-07-01	15.3156
2014-10-01	12.3805
2015-01-01	19.2727
2015-04-01	16.9924