Quarter	Billions of US Dollars
1960-01-01	0.860
1960-04-01	0.915
1960-07-01	0.947
1960-10-01	0.969
1961-01-01	1.009
1961-04-01	1.066
1961-07-01	1.088
1961-10-01	1.081
1962-01-01	1.102
1962-04-01	1.175
1962-07-01	1.233
1962-10-01	1.259
1963-01-01	1.275
1963-04-01	1.394
1963-07-01	1.439
1963-10-01	1.505
1964-01-01	1.528
1964-04-01	1.660
1964-07-01	1.682
1964-10-01	1.704
1965-01-01	1.724
1965-04-01	1.819
1965-07-01	1.844
1965-10-01	1.869
1966-01-01	1.889
1966-04-01	2.005
1966-07-01	2.055
1966-10-01	2.130
1967-01-01	2.164
1967-04-01	2.279
1967-07-01	2.361
1967-10-01	2.526
1968-01-01	2.552
1968-04-01	2.747
1968-07-01	2.839
1968-10-01	2.839
1969-01-01	2.929
1969-04-01	3.121
1969-07-01	3.285
1969-10-01	3.438
1970-01-01	3.556
1970-04-01	3.789
1970-07-01	3.989
1970-10-01	4.207
1971-01-01	4.376
1971-04-01	4.683
1971-07-01	4.884
1971-10-01	5.134
1972-01-01	5.322
1972-04-01	5.631
1972-07-01	5.894
1972-10-01	6.380
1973-01-01	6.581
1973-04-01	6.967
1973-07-01	7.213
1973-10-01	7.620
1974-01-01	7.726
1974-04-01	8.137
1974-07-01	8.556
1974-10-01	9.145
1975-01-01	9.534
1975-04-01	10.072
1975-07-01	9.298
1975-10-01	9.582
1976-01-01	9.851
1976-04-01	10.418
1976-07-01	10.908
1976-10-01	11.589
1977-01-01	12.005
1977-04-01	12.951
1977-07-01	13.671
1977-10-01	15.152
1978-01-01	15.345
1978-04-01	16.255
1978-07-01	16.909
1978-10-01	18.377
1979-01-01	18.673
1979-04-01	19.658
1979-07-01	20.363
1979-10-01	20.484
1980-01-01	19.629
1980-04-01	19.600
1980-07-01	20.281
1980-10-01	20.370
1981-01-01	19.289
1981-04-01	17.988
1981-07-01	19.584
1981-10-01	21.156
1982-01-01	19.844
1982-04-01	18.730
1982-07-01	19.366
1982-10-01	21.495
1983-01-01	18.240
1983-04-01	18.836
1983-07-01	17.639
1983-10-01	18.078
1984-01-01	17.392
1984-04-01	17.032
1984-07-01	15.554
1984-10-01	16.739
1985-01-01	16.724
1985-04-01	17.142
1985-07-01	18.301
1985-10-01	17.291
1986-01-01	18.369
1986-04-01	19.568
1986-07-01	20.679
1986-10-01	21.342
1987-01-01	22.479
1987-04-01	22.256
1987-07-01	22.182
1987-10-01	25.964
1988-01-01	25.160
1988-04-01	23.773
1988-07-01	23.262
1988-10-01	25.615
1989-01-01	24.417
1989-04-01	24.551
1989-07-01	26.134
1989-10-01	29.332
1990-01-01	29.414
1990-04-01	30.657
1990-07-01	33.009
1990-10-01	33.457
1991-01-01	29.626
1991-04-01	28.831
1991-07-01	31.294
1991-10-01	34.552
1992-01-01	32.433
1992-04-01	35.494
1992-07-01	37.280
1992-10-01	32.180
1993-01-01	31.700
1993-04-01	31.475
1993-07-01	31.549
1993-10-01	29.011
1994-01-01	29.713
1994-04-01	31.775
1994-07-01	32.657
1994-10-01	34.107
1995-01-01	37.362
1995-04-01	39.452
1995-07-01	40.201
1995-10-01	41.995
1996-01-01	42.713
1996-04-01	44.730
1996-07-01	46.274
1996-10-01	45.735
1997-01-01	43.980
1997-04-01	44.856
1997-07-01	45.398
1997-10-01	45.875
1998-01-01	42.579
1998-04-01	46.072
1998-07-01	49.091
1998-10-01	52.410
1999-01-01	51.238
1999-04-01	50.416
1999-07-01	52.601
1999-10-01	51.108
2000-01-01	47.602
2000-04-01	50.874
2000-07-01	49.832
2000-10-01	56.465
2001-01-01	56.441
2001-04-01	57.725
2001-07-01	64.629
2001-10-01	65.930
2002-01-01	66.887
2002-04-01	80.110
2002-07-01	81.399
2002-10-01	90.737
2003-01-01	97.537
2003-04-01	108.101
2003-07-01	114.181
2003-10-01	129.069
2004-01-01	130.205
2004-04-01	136.589
2004-07-01	144.343
2004-10-01	165.824
2005-01-01	164.723
2005-04-01	161.941
2005-07-01	167.532
2005-10-01	173.775
2006-01-01	186.444
2006-04-01	205.990
2006-07-01	213.488
2006-10-01	231.498
2007-01-01	244.067
2007-04-01	262.606
2007-07-01	286.957
2007-10-01	311.369
2008-01-01	350.830
2008-04-01	366.232
2008-07-01	346.224
2008-10-01	344.460
2009-01-01	331.862
2009-04-01	353.479
2009-07-01	368.705
2009-10-01	359.627
2010-01-01	338.438
2010-04-01	312.043
2010-07-01	343.312
2010-10-01	335.040
2011-01-01	353.196
2011-04-01	356.657
2011-07-01	331.677
2011-10-01	311.897
2012-01-01	315.926
2012-04-01	292.644
2012-07-01	290.306
2012-10-01	291.181
2013-01-01	283.314
2013-04-01	283.802
2013-07-01	289.403
2013-10-01	290.890
2014-01-01	288.207
2014-04-01	283.876
2014-07-01	259.437
2014-10-01	249.461
2015-01-01	221.766
2015-04-01	225.347
2015-07-01	221.071
2015-10-01	214.158
2016-01-01	222.198
2016-04-01	215.886
2016-07-01	214.295
2016-10-01	197.818
2017-01-01	198.745
2017-04-01	209.754
2017-07-01	211.894
2017-10-01	212.028
2018-01-01	212.920