Quarter	Billions of US Dollars
1966-01-01	0.020
1966-04-01	0.020
1966-07-01	0.020
1966-10-01	0.020
1967-01-01	0.020
1967-04-01	0.020
1967-07-01	0.020
1967-10-01	0.035
1968-01-01	0.035
1968-04-01	0.035
1968-07-01	0.035
1968-10-01	0.035
1969-01-01	0.035
1969-04-01	0.035
1969-07-01	0.035
1969-10-01	0.035
1970-01-01	0.035
1970-04-01	0.035
1970-07-01	0.035
1970-10-01	0.035
1971-01-01	0.050
1971-04-01	0.050
1971-07-01	0.065
1971-10-01	0.065
1972-01-01	0.186
1972-04-01	0.217
1972-07-01	0.240
1972-10-01	0.307
1973-01-01	0.413
1973-04-01	0.487
1973-07-01	0.486
1973-10-01	0.503
1974-01-01	0.547
1974-04-01	0.595
1974-07-01	0.591
1974-10-01	0.702
1975-01-01	1.015
1975-04-01	1.363
1975-07-01	1.343
1975-10-01	1.648
1976-01-01	1.960
1976-04-01	2.132
1976-07-01	2.449
1976-10-01	2.864
1977-01-01	3.160
1977-04-01	3.614
1977-07-01	4.090
1977-10-01	4.781
1978-01-01	5.007
1978-04-01	5.440
1978-07-01	5.934
1978-10-01	6.032
1979-01-01	6.153
1979-04-01	6.997
1979-07-01	7.336
1979-10-01	7.679
1980-01-01	7.729
1980-04-01	9.199
1980-07-01	9.780
1980-10-01	10.110
1981-01-01	10.313
1981-04-01	10.112
1981-07-01	10.365
1981-10-01	11.097
1982-01-01	11.905
1982-04-01	11.770
1982-07-01	11.907
1982-10-01	12.886
1983-01-01	14.541
1983-04-01	14.004
1983-07-01	13.961
1983-10-01	14.992
1984-01-01	15.903
1984-04-01	17.461
1984-07-01	18.122
1984-10-01	19.817
1985-01-01	18.654
1985-04-01	21.896
1985-07-01	23.199
1985-10-01	22.699
1986-01-01	24.352
1986-04-01	25.967
1986-07-01	28.236
1986-10-01	28.725
1987-01-01	31.641
1987-04-01	31.795
1987-07-01	31.780
1987-10-01	34.272
1988-01-01	35.256
1988-04-01	34.280
1988-07-01	34.514
1988-10-01	36.976
1989-01-01	38.432
1989-04-01	38.188
1989-07-01	40.109
1989-10-01	43.794
1990-01-01	44.563
1990-04-01	45.356
1990-07-01	48.711
1990-10-01	49.432
1991-01-01	46.785
1991-04-01	47.811
1991-07-01	49.990
1991-10-01	50.800
1992-01-01	47.527
1992-04-01	51.802
1992-07-01	55.466
1992-10-01	52.873
1993-01-01	57.272
1993-04-01	64.954
1993-07-01	70.087
1993-10-01	71.960
1994-01-01	78.239
1994-04-01	86.966
1994-07-01	91.963
1994-10-01	92.439
1995-01-01	98.500
1995-04-01	100.821
1995-07-01	100.879
1995-10-01	99.271
1996-01-01	100.559
1996-04-01	99.549
1996-07-01	103.578
1996-10-01	101.488
1997-01-01	98.661
1997-04-01	99.188
1997-07-01	98.092
1997-10-01	93.348
1998-01-01	88.825
1998-04-01	89.170
1998-07-01	89.428
1998-10-01	87.792
1999-01-01	79.482
1999-04-01	82.071
1999-07-01	86.230
1999-10-01	87.007
2000-01-01	86.863
2000-04-01	87.872
2000-07-01	82.055
2000-10-01	81.629
2001-01-01	80.019
2001-04-01	82.427
2001-07-01	84.969
2001-10-01	86.134
2002-01-01	86.348
2002-04-01	99.641
2002-07-01	98.308
2002-10-01	101.830
2003-01-01	106.156
2003-04-01	112.370
2003-07-01	117.174
2003-10-01	128.853
2004-01-01	131.500
2004-04-01	130.664
2004-07-01	133.820
2004-10-01	146.960
2005-01-01	145.161
2005-04-01	147.790
2005-07-01	152.545
2005-10-01	148.978
2006-01-01	161.393
2006-04-01	167.946
2006-07-01	167.799
2006-10-01	181.281
2007-01-01	194.094
2007-04-01	214.850
2007-07-01	221.833
2007-10-01	229.881
2008-01-01	239.598
2008-04-01	257.410
2008-07-01	247.567
2008-10-01	238.677
2009-01-01	252.232
2009-04-01	293.603
2009-07-01	323.739
2009-10-01	330.750
2010-01-01	338.200
2010-04-01	311.597
2010-07-01	338.991
2010-10-01	344.104
2011-01-01	374.065
2011-04-01	398.667
2011-07-01	384.513
2011-10-01	371.057
2012-01-01	399.400
2012-04-01	398.399
2012-07-01	415.869
2012-10-01	429.493
2013-01-01	433.402
2013-04-01	445.459
2013-07-01	470.515
2013-10-01	473.518
2014-01-01	479.548
2014-04-01	466.857
2014-07-01	448.246
2014-10-01	438.741
2015-01-01	421.762
2015-04-01	435.672