Quarter	Billions of US Dollars
1960-01-01	0.980
1960-04-01	1.042
1960-07-01	1.078
1960-10-01	1.104
1961-01-01	1.149
1961-04-01	1.214
1961-07-01	1.239
1961-10-01	1.231
1962-01-01	1.255
1962-04-01	1.338
1962-07-01	1.404
1962-10-01	1.433
1963-01-01	1.452
1963-04-01	1.587
1963-07-01	1.639
1963-10-01	1.714
1964-01-01	1.740
1964-04-01	1.890
1964-07-01	1.915
1964-10-01	1.940
1965-01-01	1.963
1965-04-01	2.071
1965-07-01	2.099
1965-10-01	2.128
1966-01-01	2.151
1966-04-01	2.283
1966-07-01	2.340
1966-10-01	2.425
1967-01-01	2.464
1967-04-01	2.595
1967-07-01	2.689
1967-10-01	2.876
1968-01-01	2.906
1968-04-01	3.128
1968-07-01	3.233
1968-10-01	3.233
1969-01-01	3.335
1969-04-01	3.554
1969-07-01	3.741
1969-10-01	3.915
1970-01-01	4.049
1970-04-01	4.315
1970-07-01	4.542
1970-10-01	4.791
1971-01-01	4.983
1971-04-01	5.333
1971-07-01	5.562
1971-10-01	5.847
1972-01-01	6.060
1972-04-01	6.412
1972-07-01	6.712
1972-10-01	7.265
1973-01-01	7.494
1973-04-01	7.934
1973-07-01	8.214
1973-10-01	8.677
1974-01-01	8.798
1974-04-01	9.266
1974-07-01	9.743
1974-10-01	10.413
1975-01-01	10.856
1975-04-01	11.469
1975-07-01	10.588
1975-10-01	10.912
1976-01-01	11.217
1976-04-01	11.863
1976-07-01	12.422
1976-10-01	13.197
1977-01-01	13.670
1977-04-01	14.747
1977-07-01	15.568
1977-10-01	17.255
1978-01-01	17.481
1978-04-01	18.506
1978-07-01	19.254
1978-10-01	20.945
1979-01-01	21.279
1979-04-01	22.391
1979-07-01	23.209
1979-10-01	23.379
1980-01-01	22.433
1980-04-01	22.470
1980-07-01	23.256
1980-10-01	23.432
1981-01-01	22.227
1981-04-01	20.726
1981-07-01	22.563
1981-10-01	24.444
1982-01-01	22.926
1982-04-01	21.743
1982-07-01	22.430
1982-10-01	24.905
1983-01-01	21.295
1983-04-01	21.962
1983-07-01	20.637
1983-10-01	21.391
1984-01-01	20.693
1984-04-01	20.295
1984-07-01	18.671
1984-10-01	20.065
1985-01-01	20.036
1985-04-01	20.573
1985-07-01	22.032
1985-10-01	20.790
1986-01-01	22.078
1986-04-01	23.450
1986-07-01	24.683
1986-10-01	25.194
1987-01-01	26.921
1987-04-01	26.458
1987-07-01	26.256
1987-10-01	30.726
1988-01-01	29.936
1988-04-01	28.304
1988-07-01	27.532
1988-10-01	29.917
1989-01-01	28.607
1989-04-01	28.483
1989-07-01	29.881
1989-10-01	34.171
1990-01-01	34.561
1990-04-01	35.856
1990-07-01	38.323
1990-10-01	38.768
1991-01-01	34.113
1991-04-01	33.295
1991-07-01	36.013
1991-10-01	40.032
1992-01-01	37.012
1992-04-01	41.171
1992-07-01	43.331
1992-10-01	37.540
1993-01-01	37.031
1993-04-01	37.357
1993-07-01	37.430
1993-10-01	34.749
1994-01-01	35.288
1994-04-01	38.438
1994-07-01	39.364
1994-10-01	41.562
1995-01-01	44.710
1995-04-01	46.702
1995-07-01	46.933
1995-10-01	48.083
1996-01-01	48.708
1996-04-01	50.588
1996-07-01	52.031
1996-10-01	51.860
1997-01-01	49.743
1997-04-01	50.637
1997-07-01	50.809
1997-10-01	51.440
1998-01-01	49.422
1998-04-01	53.542
1998-07-01	57.275
1998-10-01	61.298
1999-01-01	60.765
1999-04-01	59.519
1999-07-01	62.801
1999-10-01	61.071
2000-01-01	60.553
2000-04-01	64.493
2000-07-01	62.680
2000-10-01	69.726
2001-01-01	70.041
2001-04-01	70.662
2001-07-01	79.251
2001-10-01	80.769
2002-01-01	81.669
2002-04-01	97.772
2002-07-01	98.937
2002-10-01	109.688
2003-01-01	117.078
2003-04-01	126.437
2003-07-01	135.938
2003-10-01	154.034
2004-01-01	153.442
2004-04-01	161.223
2004-07-01	170.289
2004-10-01	195.067
2005-01-01	192.980
2005-04-01	188.337
2005-07-01	193.775
2005-10-01	202.150
2006-01-01	211.677
2006-04-01	233.062
2006-07-01	243.065
2006-10-01	266.417
2007-01-01	275.116
2007-04-01	292.029
2007-07-01	319.692
2007-10-01	348.846
2008-01-01	393.682
2008-04-01	408.317
2008-07-01	384.655
2008-10-01	381.860
2009-01-01	364.476
2009-04-01	385.459
2009-07-01	403.527
2009-10-01	399.560
2010-01-01	375.828
2010-04-01	355.912
2010-07-01	390.951
2010-10-01	386.878
2011-01-01	407.210
2011-04-01	412.890
2011-07-01	383.567
2011-10-01	348.800
2012-01-01	352.913
2012-04-01	331.491
2012-07-01	329.578
2012-10-01	331.747
2013-01-01	315.880
2013-04-01	318.161
2013-07-01	323.730
2013-10-01	324.670
2014-01-01	321.692
2014-04-01	318.701
2014-07-01	292.399
2014-10-01	280.280
2015-01-01	248.003
2015-04-01	255.710
2015-07-01	252.164
2015-10-01	244.609
2016-01-01	254.537
2016-04-01	246.702
2016-07-01	245.393
2016-10-01	231.127
2017-01-01	232.811
2017-04-01	246.150
2017-07-01	251.899
2017-10-01	252.919
2018-01-01	255.082