Quarter	Billions of US Dollars
1972-10-01	0.045
1973-01-01	0.060
1973-04-01	0.060
1973-07-01	0.060
1973-10-01	0.060
1974-01-01	0.060
1974-04-01	0.060
1974-07-01	0.060
1974-10-01	0.060
1975-01-01	0.060
1975-04-01	0.060
1975-07-01	0.060
1975-10-01	0.060
1976-01-01	0.060
1976-04-01	0.060
1976-07-01	0.060
1976-10-01	0.060
1977-01-01	0.060
1977-04-01	0.060
1977-07-01	0.060
1977-10-01	0.060
1978-01-01	0.060
1978-04-01	0.060
1978-07-01	0.060
1978-10-01	0.060
1979-01-01	0.060
1979-04-01	0.060
1979-07-01	0.060
1979-10-01	0.060
1980-01-01	0.060
1980-04-01	0.060
1980-07-01	0.060
1980-10-01	0.060
1981-01-01	0.060
1981-04-01	0.060
1981-07-01	0.090
1981-10-01	0.090
1982-01-01	0.090
1982-04-01	0.090
1982-07-01	0.090
1982-10-01	0.140
1983-01-01	0.161
1983-04-01	0.161
1983-07-01	0.182
1983-10-01	0.183
1984-01-01	0.185
1984-04-01	0.332
1984-07-01	0.357
1984-10-01	0.360
1985-01-01	0.658
1985-04-01	0.823
1985-07-01	1.152
1985-10-01	1.185
1986-01-01	1.217
1986-04-01	1.277
1986-07-01	1.370
1986-10-01	1.200
1987-01-01	1.366
1987-04-01	1.522
1987-07-01	1.603
1987-10-01	1.758
1988-01-01	1.878
1988-04-01	1.871
1988-07-01	1.980
1988-10-01	2.071
1989-01-01	2.458
1989-04-01	2.512
1989-07-01	2.586
1989-10-01	3.113
1990-01-01	3.157
1990-04-01	3.206
1990-07-01	3.981
1990-10-01	4.309
1991-01-01	5.370
1991-04-01	6.014
1991-07-01	6.226
1991-10-01	6.963
1992-01-01	7.131
1992-04-01	8.347
1992-07-01	9.223
1992-10-01	9.285
1993-01-01	10.677
1993-04-01	11.918
1993-07-01	12.630
1993-10-01	13.561
1994-01-01	13.998
1994-04-01	15.084
1994-07-01	16.441
1994-10-01	18.148
1995-01-01	20.020
1995-04-01	20.227
1995-07-01	19.098
1995-10-01	19.273
1996-01-01	20.767
1996-04-01	20.248
1996-07-01	21.473
1996-10-01	21.213
1997-01-01	20.015
1997-04-01	20.506
1997-07-01	19.559
1997-10-01	20.926
1998-01-01	24.164
1998-04-01	23.560
1998-07-01	24.164
1998-10-01	25.396
1999-01-01	25.557
1999-04-01	25.488
1999-07-01	27.154
1999-10-01	26.113
2000-01-01	28.175
2000-04-01	28.728
2000-07-01	27.835
2000-10-01	28.103
2001-01-01	26.391
2001-04-01	26.055
2001-07-01	28.950
2001-10-01	28.495
2002-01-01	33.099
2002-04-01	38.080
2002-07-01	37.515
2002-10-01	38.925
2003-01-01	49.326
2003-04-01	54.341
2003-07-01	56.975
2003-10-01	63.120
2004-01-01	62.150
2004-04-01	67.610
2004-07-01	69.688
2004-10-01	77.734
2005-01-01	78.908
2005-04-01	77.323
2005-07-01	78.795
2005-10-01	79.620
2006-01-01	89.451
2006-04-01	97.362
2006-07-01	102.896
2006-10-01	116.687
2007-01-01	134.362
2007-04-01	141.228
2007-07-01	147.207
2007-10-01	153.722
2008-01-01	166.406
2008-04-01	166.032
2008-07-01	152.582
2008-10-01	161.749
2009-01-01	185.083
2009-04-01	223.414
2009-07-01	236.222
2009-10-01	232.070
2010-01-01	222.164
2010-04-01	240.133
2010-07-01	272.279
2010-10-01	287.359
2011-01-01	303.433
2011-04-01	316.169
2011-07-01	294.657
2011-10-01	277.333
2012-01-01	256.107
2012-04-01	231.227
2012-07-01	221.552
2012-10-01	226.250
2013-01-01	217.913
2013-04-01	199.424
2013-07-01	196.640
2013-10-01	189.809
2014-01-01	186.598
2014-04-01	194.435
2014-07-01	182.169
2014-10-01	175.810
2015-01-01	144.610
2015-04-01	137.603