Quarter	Billions of US Dollars
1978-10-01	14.541
1979-01-01	14.928
1979-04-01	15.640
1979-07-01	16.977
1979-10-01	18.648
1980-01-01	18.176
1980-04-01	17.709
1980-07-01	22.325
1980-10-01	24.908
1981-01-01	26.780
1981-04-01	28.906
1981-07-01	27.760
1981-10-01	31.456
1982-01-01	33.316
1982-04-01	35.483
1982-07-01	35.062
1982-10-01	35.538
1983-01-01	35.648
1983-04-01	34.424
1983-07-01	32.757
1983-10-01	33.398
1984-01-01	33.801
1984-04-01	34.441
1984-07-01	34.838
1984-10-01	35.560
1985-01-01	36.066
1985-04-01	36.913
1985-07-01	37.196
1985-10-01	37.611
1986-01-01	38.875
1986-04-01	39.870
1986-07-01	42.618
1986-10-01	43.625
1987-01-01	47.814
1987-04-01	50.581
1987-07-01	57.284
1987-10-01	60.068
1988-01-01	60.748
1988-04-01	65.365
1988-07-01	69.413
1988-10-01	74.357
1989-01-01	84.301
1989-04-01	88.479
1989-07-01	93.037
1989-10-01	98.182
1990-01-01	100.124
1990-04-01	105.970
1990-07-01	109.334
1990-10-01	116.130
1991-01-01	117.609
1991-04-01	113.732
1991-07-01	118.235
1991-10-01	122.158
1992-01-01	126.337
1992-04-01	132.102
1992-07-01	135.853
1992-10-01	135.466
1993-01-01	144.126
1993-04-01	149.567
1993-07-01	156.392
1993-10-01	159.278
1994-01-01	168.240
1994-04-01	177.404
1994-07-01	182.169
1994-10-01	186.762
1995-01-01	193.077
1995-04-01	199.846
1995-07-01	203.644
1995-10-01	208.207
1996-01-01	215.148
1996-04-01	226.034
1996-07-01	230.515
1996-10-01	240.831
1997-01-01	259.286
1997-04-01	278.734
1997-07-01	295.266
1997-10-01	293.954
1998-01-01	289.805
1998-04-01	288.558
1998-07-01	282.941
1998-10-01	275.831
1999-01-01	268.095
1999-04-01	258.218
1999-07-01	254.472
1999-10-01	251.770
2000-01-01	250.971
2000-04-01	250.077
2000-07-01	258.952
2000-10-01	254.392
2001-01-01	252.054
2001-04-01	250.030
2001-07-01	245.756
2001-10-01	242.155
2002-01-01	242.461
2002-04-01	241.127
2002-07-01	237.259
2002-10-01	236.409
2003-01-01	235.963
2003-04-01	235.393
2003-07-01	233.696
2003-10-01	235.554
2004-01-01	235.674
2004-04-01	240.003
2004-07-01	241.679
2004-10-01	249.893
2005-01-01	253.209
2005-04-01	264.016
2005-07-01	264.673
2005-10-01	270.021
2006-01-01	269.322
2006-04-01	276.714
2006-07-01	280.102
2006-10-01	276.293
2007-01-01	297.073
2007-04-01	315.056
2007-07-01	335.803
2007-10-01	319.543
2008-01-01	340.242
2008-04-01	355.372
2008-07-01	366.244
2008-10-01	353.159
2009-01-01	339.256
2009-04-01	344.926
2009-07-01	350.951
2009-10-01	344.847
2010-01-01	360.235
2010-04-01	385.777
2010-07-01	423.286
2010-10-01	424.617
2011-01-01	454.388
2011-04-01	474.780
2011-07-01	485.741
2011-10-01	483.888
2012-01-01	491.222
2012-04-01	498.990
2012-07-01	506.827
2012-10-01	513.867
2013-01-01	528.458
2013-04-01	566.111
2013-07-01	586.903
2013-10-01	584.103
2014-01-01	622.128
2014-04-01	650.216
2014-07-01	657.680
2014-10-01	652.083
2015-01-01	688.580
2015-04-01	684.941
2015-07-01	676.327
2015-10-01	677.879
2016-01-01	678.174
2016-04-01	698.533
2016-07-01	709.500
2016-10-01	727.133
2017-01-01	754.774
2017-04-01	790.336
2017-07-01	811.284
2017-10-01	833.573
2018-01-01	859.998