Quarter	Billions of US Dollars
1980-10-01	36.701
1981-01-01	33.777
1981-04-01	29.825
1981-07-01	30.895
1981-10-01	31.182
1982-01-01	26.458
1982-04-01	25.828
1982-07-01	24.615
1982-10-01	27.171
1983-01-01	26.320
1983-04-01	24.890
1983-07-01	23.816
1983-10-01	23.449
1984-01-01	24.629
1984-04-01	23.426
1984-07-01	21.501
1984-10-01	21.393
1985-01-01	21.877
1985-04-01	22.301
1985-07-01	25.218
1985-10-01	28.109
1986-01-01	30.068
1986-04-01	32.527
1986-07-01	34.914
1986-10-01	37.636
1987-01-01	41.385
1987-04-01	42.687
1987-07-01	42.568
1987-10-01	50.625
1988-01-01	49.335
1988-04-01	46.696
1988-07-01	46.127
1988-10-01	50.559
1989-01-01	48.367
1989-04-01	49.475
1989-07-01	52.675
1989-10-01	60.415
1990-01-01	62.156
1990-04-01	65.776
1990-07-01	70.703
1990-10-01	75.769
1991-01-01	67.436
1991-04-01	65.467
1991-07-01	71.865
1991-10-01	80.223
1992-01-01	75.067
1992-04-01	83.601
1992-07-01	90.885
1992-10-01	84.269
1993-01-01	84.853
1993-04-01	82.505
1993-07-01	81.108
1993-10-01	79.930
1994-01-01	83.241
1994-04-01	90.866
1994-07-01	94.930
1994-10-01	94.734
1995-01-01	107.206
1995-04-01	109.815
1995-07-01	105.921
1995-10-01	106.493
1996-01-01	103.442
1996-04-01	103.637
1996-07-01	104.142
1996-10-01	103.908
1997-01-01	96.566
1997-04-01	95.916
1997-07-01	96.455
1997-10-01	96.207
1998-01-01	93.084
1998-04-01	100.738
1998-07-01	109.207
1998-10-01	113.308
1999-01-01	108.819
1999-04-01	103.122
1999-07-01	108.512
1999-10-01	102.462
2000-01-01	98.092
2000-04-01	98.383
2000-07-01	90.596
2000-10-01	97.303
2001-01-01	92.299
2001-04-01	89.729
2001-07-01	93.828
2001-10-01	91.102
2002-01-01	89.662
2002-04-01	104.526
2002-07-01	103.625
2002-10-01	112.764
2003-01-01	117.500
2003-04-01	125.419
2003-07-01	127.505
2003-10-01	140.424
2004-01-01	137.967
2004-04-01	138.304
2004-07-01	144.514
2004-10-01	163.812
2005-01-01	160.277
2005-04-01	155.105
2005-07-01	157.069
2005-10-01	158.346
2006-01-01	166.538
2006-04-01	179.673
2006-07-01	182.818
2006-10-01	194.916
2007-01-01	201.369
2007-04-01	208.497
2007-07-01	224.184
2007-10-01	238.210
2008-01-01	260.528
2008-04-01	265.930
2008-07-01	246.207
2008-10-01	244.138
2009-01-01	236.175
2009-04-01	254.526
2009-07-01	267.423
2009-10-01	260.919
2010-01-01	246.808
2010-04-01	228.332
2010-07-01	258.031
2010-10-01	257.135
2011-01-01	276.951
2011-04-01	288.633
2011-07-01	273.246
2011-10-01	269.451
2012-01-01	280.681
2012-04-01	268.616
2012-07-01	275.398
2012-10-01	283.654
2013-01-01	277.108
2013-04-01	286.576
2013-07-01	298.221
2013-10-01	305.237
2014-01-01	307.055
2014-04-01	308.133
2014-07-01	287.189
2014-10-01	284.441
2015-01-01	254.599
2015-04-01	266.482
2015-07-01	269.322
2015-10-01	264.736
2016-01-01	279.123
2016-04-01	275.231
2016-07-01	278.544
2016-10-01	265.413
2017-01-01	272.096
2017-04-01	294.917
2017-07-01	308.048
2017-10-01	316.764
2018-01-01	327.960