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	1.1050
1994-10-01	1.1102
1995-01-01	1.1374
1995-04-01	1.2854
1995-07-01	1.3958
1995-10-01	1.6334
1996-01-01	2.1010
1996-04-01	2.6206
1996-07-01	3.0949
1996-10-01	3.2987
1997-01-01	4.2345
1997-04-01	4.4436
1997-07-01	4.4030
1997-10-01	4.5044
1998-01-01	4.8756
1998-04-01	5.3714
1998-07-01	5.9332
1998-10-01	5.9801
1999-01-01	6.3239
1999-04-01	6.7994
1999-07-01	6.7718
1999-10-01	7.2284
2000-01-01	7.9321
2000-04-01	8.0811
2000-07-01	8.2677
2000-10-01	8.4562
2001-01-01	9.0999
2001-04-01	10.6228
2001-07-01	10.9217
2001-10-01	11.6639
2002-01-01	11.4192
2002-04-01	11.0464
2002-07-01	11.4155
2002-10-01	12.0670
2003-01-01	12.2566
2003-04-01	11.8162
2003-07-01	12.3151
2003-10-01	13.0091
2004-01-01	12.5833
2004-04-01	12.6064
2004-07-01	13.1465
2004-10-01	13.9555
2005-01-01	14.2629
2005-04-01	14.2589
2005-07-01	14.2443
2005-10-01	14.3298
2006-01-01	14.1177
2006-04-01	13.3821
2006-07-01	15.6046
2006-10-01	16.1648
2007-01-01	15.7420
2007-04-01	17.0495
2007-07-01	17.3530
2007-10-01	18.0172
2008-01-01	18.0009
2008-04-01	17.7256
2008-07-01	17.1285
2008-10-01	17.1141
2009-01-01	17.6628
2009-04-01	18.2373
2009-07-01	20.6750
2009-10-01	21.9511
2010-01-01	21.4431
2010-04-01	22.0319
2010-07-01	23.7686
2010-10-01	22.7760
2011-01-01	24.5930
2011-04-01	25.3352
2011-07-01	27.0024
2011-10-01	27.3907
2012-01-01	28.9050
2012-04-01	29.7125
2012-07-01	33.0141
2012-10-01	32.7473
2013-01-01	33.7128
2013-04-01	33.6924
2013-07-01	37.8351
2013-10-01	37.9173
2014-01-01	38.8065
2014-04-01	41.5651
2014-07-01	43.0277
2014-10-01	41.8457
2015-01-01	44.4607
2015-04-01	46.3536