Quarter	Billions of US Dollars
1973-01-01	0.0200
1973-04-01	0.0200
1973-07-01	0.0450
1973-10-01	0.0450
1974-01-01	0.0450
1974-04-01	0.0450
1974-07-01	0.0450
1974-10-01	0.0450
1975-01-01	0.0450
1975-04-01	0.0450
1975-07-01	0.0450
1975-10-01	0.0450
1976-01-01	0.0450
1976-04-01	0.0450
1976-07-01	0.0450
1976-10-01	0.0450
1977-01-01	0.0450
1977-04-01	0.0450
1977-07-01	0.0450
1977-10-01	0.0450
1978-01-01	0.0450
1978-04-01	0.0450
1978-07-01	0.0450
1978-10-01	0.0450
1979-01-01	0.0450
1979-04-01	0.0450
1979-07-01	0.0450
1979-10-01	0.0450
1980-01-01	0.0700
1980-04-01	0.1000
1980-07-01	0.1000
1980-10-01	0.1000
1981-01-01	0.1000
1981-04-01	0.1000
1981-07-01	0.1000
1981-10-01	0.1000
1982-01-01	0.1000
1982-04-01	0.1000
1982-07-01	0.1000
1982-10-01	0.1000
1983-01-01	0.1000
1983-04-01	0.1000
1983-07-01	0.1000
1983-10-01	0.1000
1984-01-01	0.1000
1984-04-01	0.1000
1984-07-01	0.1000
1984-10-01	0.1000
1985-01-01	0.0750
1985-04-01	0.0450
1985-07-01	0.0450
1985-10-01	0.0295
1986-01-01	0.0295
1986-04-01	0.0295
1986-07-01	0.0686
1986-10-01	0.0650
1987-01-01	0.0684
1987-04-01	0.1173
1987-07-01	0.1167
1987-10-01	0.1243
1988-01-01	0.1228
1988-04-01	0.1203
1988-07-01	0.0946
1988-10-01	0.0977
1989-01-01	0.0954
1989-04-01	0.0916
1989-07-01	0.0931
1989-10-01	0.0918
1990-01-01	0.0882
1990-04-01	0.0892
1990-07-01	0.0935
1990-10-01	0.0946
1991-01-01	0.0926
1991-04-01	0.2935
1991-07-01	0.2952
1991-10-01	0.2979
1992-01-01	0.2950
1992-04-01	0.2478
1992-07-01	0.2503
1992-10-01	0.2481
1993-01-01	0.2516
1993-04-01	0.3812
1993-07-01	0.5821
1993-10-01	0.6936
1994-01-01	1.0442
1994-04-01	1.0476
1994-07-01	0.9800
1994-10-01	1.0252
1995-01-01	1.0524
1995-04-01	1.2154
1995-07-01	1.3258
1995-10-01	1.5634
1996-01-01	2.0310
1996-04-01	2.6156
1996-07-01	3.0899
1996-10-01	3.2937
1997-01-01	4.2295
1997-04-01	4.4386
1997-07-01	4.3980
1997-10-01	4.4994
1998-01-01	4.8706
1998-04-01	5.3664
1998-07-01	5.9282
1998-10-01	5.9751
1999-01-01	6.3189
1999-04-01	6.9700
1999-07-01	7.0674
1999-10-01	7.4690
2000-01-01	8.1727
2000-04-01	8.3217
2000-07-01	8.5030
2000-10-01	8.6916
2001-01-01	9.3353
2001-04-01	10.7984
2001-07-01	11.0973
2001-10-01	11.8395
2002-01-01	11.5948
2002-04-01	11.2220
2002-07-01	11.5911
2002-10-01	12.2426
2003-01-01	12.4322
2003-04-01	11.9918
2003-07-01	12.4476
2003-10-01	12.6416
2004-01-01	12.2158
2004-04-01	12.1939
2004-07-01	12.5584
2004-10-01	13.3674
2005-01-01	13.6868
2005-04-01	13.6858
2005-07-01	13.7043
2005-10-01	13.7898
2006-01-01	13.5777
2006-04-01	12.8821
2006-07-01	15.1046
2006-10-01	15.6648
2007-01-01	15.7960
2007-04-01	17.1035
2007-07-01	17.4070
2007-10-01	18.8212
2008-01-01	18.8049
2008-04-01	18.5296
2008-07-01	17.9325
2008-10-01	17.9181
2009-01-01	18.4668
2009-04-01	19.0413
2009-07-01	21.4790
2009-10-01	23.1551
2010-01-01	22.4471
2010-04-01	23.0507
2010-07-01	24.7874
2010-10-01	24.2953
2011-01-01	25.7203
2011-04-01	26.4368
2011-07-01	28.1342
2011-10-01	28.8280
2012-01-01	29.4856
2012-04-01	30.2096
2012-07-01	33.5091
2012-10-01	33.2430
2013-01-01	34.8239
2013-04-01	35.2935
2013-07-01	39.4361
2013-10-01	41.1195
2014-01-01	42.0172
2014-04-01	45.2589
2014-07-01	47.4973
2014-10-01	46.3959
2015-01-01	48.5301
2015-04-01	50.0530