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	20.306
1997-07-01	19.359
1997-10-01	20.726
1998-01-01	23.789
1998-04-01	22.835
1998-07-01	23.439
1998-10-01	24.671
1999-01-01	24.832
1999-04-01	23.838
1999-07-01	25.385
1999-10-01	24.412
2000-01-01	25.232
2000-04-01	25.440
2000-07-01	24.016
2000-10-01	24.089
2001-01-01	22.547
2001-04-01	22.127
2001-07-01	23.857
2001-10-01	23.556
2002-01-01	28.052
2002-04-01	31.509
2002-07-01	30.936
2002-10-01	31.531
2003-01-01	41.715
2003-04-01	44.681
2003-07-01	45.864
2003-10-01	48.719
2004-01-01	46.600
2004-04-01	48.964
2004-07-01	49.159
2004-10-01	52.352
2005-01-01	50.368
2005-04-01	48.182
2005-07-01	48.896
2005-10-01	47.536
2006-01-01	53.859
2006-04-01	58.548
2006-07-01	60.871
2006-10-01	68.247
2007-01-01	76.616
2007-04-01	77.427
2007-07-01	81.976
2007-10-01	83.472
2008-01-01	86.418
2008-04-01	82.170
2008-07-01	74.640
2008-10-01	77.100
2009-01-01	92.426
2009-04-01	119.731
2009-07-01	123.931
2009-10-01	124.639
2010-01-01	120.361
2010-04-01	153.680
2010-07-01	176.580
2010-10-01	195.711
2011-01-01	212.730
2011-04-01	230.505
2011-07-01	214.868
2011-10-01	202.967
2012-01-01	188.097
2012-04-01	167.686
2012-07-01	165.106
2012-10-01	167.997
2013-01-01	162.639
2013-04-01	143.872
2013-07-01	142.270
2013-10-01	134.981
2014-01-01	131.378
2014-04-01	134.853
2014-07-01	126.506
2014-10-01	122.656
2015-01-01	96.240
2015-04-01	88.125