Quarter	Billions of US Dollars
1966-07-01	0.015
1966-10-01	0.015
1967-01-01	0.029
1967-04-01	0.029
1967-07-01	0.029
1967-10-01	0.029
1968-01-01	0.029
1968-04-01	0.029
1968-07-01	0.029
1968-10-01	0.029
1969-01-01	0.029
1969-04-01	0.029
1969-07-01	0.029
1969-10-01	0.030
1970-01-01	0.030
1970-04-01	0.030
1970-07-01	0.030
1970-10-01	0.030
1971-01-01	0.030
1971-04-01	0.031
1971-07-01	0.032
1971-10-01	0.032
1972-01-01	0.032
1972-04-01	0.066
1972-07-01	0.086
1972-10-01	0.132
1973-01-01	0.188
1973-04-01	0.263
1973-07-01	0.295
1973-10-01	0.331
1974-01-01	0.408
1974-04-01	0.454
1974-07-01	0.610
1974-10-01	1.047
1975-01-01	1.458
1975-04-01	1.713
1975-07-01	1.680
1975-10-01	1.747
1976-01-01	1.896
1976-04-01	1.968
1976-07-01	2.143
1976-10-01	2.497
1977-01-01	2.762
1977-04-01	3.114
1977-07-01	3.658
1977-10-01	4.243
1978-01-01	4.725
1978-04-01	5.054
1978-07-01	6.061
1978-10-01	6.363
1979-01-01	6.472
1979-04-01	6.740
1979-07-01	7.428
1979-10-01	7.460
1980-01-01	6.818
1980-04-01	7.975
1980-07-01	8.257
1980-10-01	8.068
1981-01-01	7.811
1981-04-01	7.600
1981-07-01	7.993
1981-10-01	8.906
1982-01-01	8.807
1982-04-01	8.639
1982-07-01	8.548
1982-10-01	9.216
1983-01-01	9.142
1983-04-01	9.231
1983-07-01	9.286
1983-10-01	9.034
1984-01-01	9.546
1984-04-01	9.316
1984-07-01	8.980
1984-10-01	8.933
1985-01-01	9.131
1985-04-01	9.648
1985-07-01	11.028
1985-10-01	11.441
1986-01-01	12.778
1986-04-01	14.360
1986-07-01	15.802
1986-10-01	16.080
1987-01-01	17.994
1987-04-01	18.351
1987-07-01	18.319
1987-10-01	21.691
1988-01-01	23.042
1988-04-01	22.212
1988-07-01	22.139
1988-10-01	23.446
1989-01-01	22.977
1989-04-01	22.780
1989-07-01	23.671
1989-10-01	25.284
1990-01-01	26.065
1990-04-01	27.609
1990-07-01	29.989
1990-10-01	31.071
1991-01-01	30.013
1991-04-01	29.048
1991-07-01	31.315
1991-10-01	34.150
1992-01-01	33.231
1992-04-01	36.363
1992-07-01	38.990
1992-10-01	35.491
1993-01-01	36.604
1993-04-01	37.807
1993-07-01	39.802
1993-10-01	39.589
1994-01-01	43.115
1994-04-01	44.690
1994-07-01	45.786
1994-10-01	47.625
1995-01-01	56.274
1995-04-01	57.597
1995-07-01	55.867
1995-10-01	56.407
1996-01-01	57.696
1996-04-01	57.593
1996-07-01	57.762
1996-10-01	55.712
1997-01-01	54.322
1997-04-01	54.992
1997-07-01	55.867
1997-10-01	54.011
1998-01-01	55.405
1998-04-01	56.928
1998-07-01	61.565
1998-10-01	65.856
1999-01-01	66.530
1999-04-01	68.106
1999-07-01	69.076
1999-10-01	67.584
2000-01-01	67.899
2000-04-01	70.964
2000-07-01	70.078
2000-10-01	72.693
2001-01-01	73.920
2001-04-01	73.067
2001-07-01	79.904
2001-10-01	82.843
2002-01-01	91.783
2002-04-01	105.657
2002-07-01	106.177
2002-10-01	113.120
2003-01-01	120.186
2003-04-01	135.024
2003-07-01	144.209
2003-10-01	156.595
2004-01-01	163.600
2004-04-01	167.714
2004-07-01	171.656
2004-10-01	187.744
2005-01-01	195.128
2005-04-01	195.230
2005-07-01	193.715
2005-10-01	195.651
2006-01-01	204.553
2006-04-01	224.817
2006-07-01	229.211
2006-10-01	250.827
2007-01-01	278.450
2007-04-01	285.428
2007-07-01	303.521
2007-10-01	319.267
2008-01-01	350.189
2008-04-01	346.877
2008-07-01	318.627
2008-10-01	319.391
2009-01-01	314.152
2009-04-01	340.503
2009-07-01	357.936
2009-10-01	349.426
2010-01-01	332.031
2010-04-01	306.781
2010-07-01	336.219
2010-10-01	328.827
2011-01-01	343.939
2011-04-01	347.994
2011-07-01	328.881
2011-10-01	311.855
2012-01-01	310.799
2012-04-01	294.402
2012-07-01	301.856
2012-10-01	303.334
2013-01-01	288.858
2013-04-01	300.798
2013-07-01	309.217
2013-10-01	309.428
2014-01-01	291.873
2014-04-01	290.213
2014-07-01	263.340
2014-10-01	260.150
2015-01-01	234.139
2015-04-01	240.395