Quarter	Billions of US Dollars
1979-10-01	26.152
1980-01-01	27.159
1980-04-01	29.669
1980-07-01	30.201
1980-10-01	31.138
1981-01-01	31.121
1981-04-01	30.147
1981-07-01	30.683
1981-10-01	32.688
1982-01-01	31.533
1982-04-01	29.146
1982-07-01	29.341
1982-10-01	31.011
1983-01-01	30.160
1983-04-01	27.165
1983-07-01	27.133
1983-10-01	28.349
1984-01-01	29.020
1984-04-01	27.917
1984-07-01	27.171
1984-10-01	26.956
1985-01-01	26.829
1985-04-01	27.294
1985-07-01	28.909
1985-10-01	30.845
1986-01-01	32.052
1986-04-01	32.587
1986-07-01	33.825
1986-10-01	34.392
1987-01-01	36.095
1987-04-01	35.116
1987-07-01	35.554
1987-10-01	39.781
1988-01-01	38.912
1988-04-01	36.055
1988-07-01	35.821
1988-10-01	39.210
1989-01-01	36.097
1989-04-01	35.089
1989-07-01	37.594
1989-10-01	42.497
1990-01-01	43.524
1990-04-01	47.059
1990-07-01	48.864
1990-10-01	51.487
1991-01-01	48.729
1991-04-01	50.109
1991-07-01	56.768
1991-10-01	63.110
1992-01-01	59.368
1992-04-01	68.622
1992-07-01	73.130
1992-10-01	67.191
1993-01-01	65.119
1993-04-01	64.229
1993-07-01	61.657
1993-10-01	62.519
1994-01-01	64.726
1994-04-01	67.772
1994-07-01	70.692
1994-10-01	73.594
1995-01-01	78.300
1995-04-01	77.745
1995-07-01	76.046
1995-10-01	76.738
1996-01-01	80.575
1996-04-01	79.355
1996-07-01	81.169
1996-10-01	82.997
1997-01-01	80.197
1997-04-01	76.806
1997-07-01	75.013
1997-10-01	76.031
1998-01-01	80.576
1998-04-01	83.561
1998-07-01	91.455
1998-10-01	96.046
1999-01-01	90.609
1999-04-01	91.312
1999-07-01	97.273
1999-10-01	93.844
2000-01-01	95.478
2000-04-01	97.595
2000-07-01	91.360
2000-10-01	98.595
2001-01-01	98.927
2001-04-01	97.509
2001-07-01	108.170
2001-10-01	106.743
2002-01-01	112.213
2002-04-01	127.867
2002-07-01	129.955
2002-10-01	142.558
2003-01-01	159.932
2003-04-01	168.524
2003-07-01	170.931
2003-10-01	186.843
2004-01-01	206.648
2004-04-01	204.198
2004-07-01	205.423
2004-10-01	224.909
2005-01-01	208.758
2005-04-01	199.163
2005-07-01	195.279
2005-10-01	200.347
2006-01-01	192.917
2006-04-01	206.130
2006-07-01	205.406
2006-10-01	227.055
2007-01-01	236.225
2007-04-01	246.455
2007-07-01	262.226
2007-10-01	283.794
2008-01-01	314.070
2008-04-01	327.108
2008-07-01	301.663
2008-10-01	296.757
2009-01-01	295.169
2009-04-01	316.975
2009-07-01	325.452
2009-10-01	315.657
2010-01-01	288.954
2010-04-01	269.170
2010-07-01	297.234
2010-10-01	301.032
2011-01-01	324.316
2011-04-01	336.293
2011-07-01	313.161
2011-10-01	295.259
2012-01-01	316.351
2012-04-01	296.460
2012-07-01	306.018
2012-10-01	313.237
2013-01-01	303.630
2013-04-01	307.455
2013-07-01	313.980
2013-10-01	316.612
2014-01-01	311.045
2014-04-01	300.937
2014-07-01	276.576
2014-10-01	266.335
2015-01-01	234.798
2015-04-01	242.657
2015-07-01	240.257
2015-10-01	233.799
2016-01-01	241.819
2016-04-01	233.349
2016-07-01	233.345
2016-10-01	218.542
2017-01-01	221.606
2017-04-01	235.959
2017-07-01	244.215
2017-10-01	247.232
2018-01-01	251.884