Quarter	Billions of US Dollars
1976-01-01	7.202
1976-04-01	7.733
1976-07-01	8.206
1976-10-01	8.629
1977-01-01	8.958
1977-04-01	9.220
1977-07-01	9.442
1977-10-01	9.530
1978-01-01	9.866
1978-04-01	10.444
1978-07-01	10.977
1978-10-01	8.631
1979-01-01	9.046
1979-04-01	9.415
1979-07-01	10.006
1979-10-01	10.025
1980-01-01	10.059
1980-04-01	10.901
1980-07-01	11.762
1980-10-01	12.573
1981-01-01	13.010
1981-04-01	13.868
1981-07-01	15.052
1981-10-01	15.879
1982-01-01	16.545
1982-04-01	19.694
1982-07-01	19.070
1982-10-01	19.144
1983-01-01	19.509
1983-04-01	14.168
1983-07-01	14.873
1983-10-01	15.391
1984-01-01	16.135
1984-04-01	16.724
1984-07-01	17.038
1984-10-01	17.517
1985-01-01	17.546
1985-04-01	18.060
1985-07-01	18.812
1985-10-01	19.694
1986-01-01	19.920
1986-04-01	20.686
1986-07-01	15.410
1986-10-01	16.060
1987-01-01	16.942
1987-04-01	18.426
1987-07-01	19.256
1987-10-01	19.910
1988-01-01	21.133
1988-04-01	22.699
1988-07-01	24.391
1988-10-01	25.508
1989-01-01	26.724
1989-04-01	29.404
1989-07-01	32.346
1989-10-01	35.654
1990-01-01	39.736
1990-04-01	44.942
1990-07-01	49.315
1990-10-01	51.966
1991-01-01	52.462
1991-04-01	54.398
1991-07-01	53.237
1991-10-01	56.961
1992-01-01	57.874
1992-04-01	58.453
1992-07-01	60.212
1992-10-01	59.825
1993-01-01	60.320
1993-04-01	64.821
1993-07-01	67.737
1993-10-01	70.242
1994-01-01	72.933
1994-04-01	75.911
1994-07-01	80.545
1994-10-01	85.933
1995-01-01	87.645
1995-04-01	93.292
1995-07-01	97.466
1995-10-01	102.607
1996-01-01	103.710
1996-04-01	112.032
1996-07-01	117.767
1996-10-01	123.988
1997-01-01	126.603
1997-04-01	134.207
1997-07-01	112.524
1997-10-01	81.319
1998-01-01	57.278
1998-04-01	42.045
1998-07-01	50.091
1998-10-01	60.738
1999-01-01	42.137
1999-04-01	37.699
1999-07-01	31.339
1999-10-01	32.068
2000-01-01	29.364
2000-04-01	27.450
2000-07-01	28.392
2000-10-01	27.573
2001-01-01	27.431
2001-04-01	26.893
2001-07-01	31.321
2001-10-01	29.142
2002-01-01	30.700
2002-04-01	35.537
2002-07-01	37.500
2002-10-01	40.482
2003-01-01	42.039
2003-04-01	46.393
2003-07-01	48.228
2003-10-01	51.177
2004-01-01	51.747
2004-04-01	54.019
2004-07-01	58.535
2004-10-01	62.050
2005-01-01	63.900
2005-04-01	67.052
2005-07-01	68.769
2005-10-01	73.281
2006-01-01	78.763
2006-04-01	80.155
2006-07-01	83.935
2006-10-01	91.315
2007-01-01	91.093
2007-04-01	98.331
2007-07-01	103.048
2007-10-01	109.830
2008-01-01	116.298
2008-04-01	127.825
2008-07-01	136.019
2008-10-01	122.042
2009-01-01	113.718
2009-04-01	132.475
2009-07-01	143.714
2009-10-01	154.149
2010-01-01	160.951
2010-04-01	175.611
2010-07-01	186.744
2010-10-01	196.916
2011-01-01	207.305
2011-04-01	226.862
2011-07-01	229.058
2011-10-01	243.217
2012-01-01	248.909
2012-04-01	261.056
2012-07-01	268.603
2012-10-01	283.085
2013-01-01	285.814
2013-04-01	299.151
2013-07-01	276.367
2013-10-01	270.632
2014-01-01	291.434
2014-04-01	290.967
2014-07-01	291.750
2014-10-01	296.952
2015-01-01	283.438
2015-04-01	290.291
2015-07-01	272.704
2015-10-01	291.363
2016-01-01	305.610
2016-04-01	316.663
2016-07-01	325.463
2016-10-01	327.869
2017-01-01	330.889
2017-04-01	338.794
2017-07-01	339.431
2017-10-01	350.695
2018-01-01	347.188