Quarter	Billions of US Dollars
1983-01-01	15.662
1983-04-01	15.226
1983-07-01	14.630
1983-10-01	14.770
1984-01-01	15.269
1984-04-01	15.032
1984-07-01	13.602
1984-10-01	14.280
1985-01-01	13.645
1985-04-01	12.554
1985-07-01	11.820
1985-10-01	11.635
1986-01-01	11.542
1986-04-01	11.209
1986-07-01	10.894
1986-10-01	11.116
1987-01-01	11.240
1987-04-01	11.400
1987-07-01	11.708
1987-10-01	11.932
1988-01-01	11.992
1988-04-01	12.335
1988-07-01	13.457
1988-10-01	14.422
1989-01-01	15.354
1989-04-01	14.876
1989-07-01	16.081
1989-10-01	17.185
1990-01-01	18.168
1990-04-01	18.601
1990-07-01	18.575
1990-10-01	19.442
1991-01-01	19.396
1991-04-01	19.790
1991-07-01	20.402
1991-10-01	21.073
1992-01-01	23.336
1992-04-01	24.364
1992-07-01	25.473
1992-10-01	27.596
1993-01-01	28.091
1993-04-01	29.780
1993-07-01	31.503
1993-10-01	32.780
1994-01-01	34.067
1994-04-01	35.768
1994-07-01	38.253
1994-10-01	41.256
1995-01-01	43.586
1995-04-01	48.051
1995-07-01	49.359
1995-10-01	53.433
1996-01-01	55.829
1996-04-01	57.713
1996-07-01	60.162
1996-10-01	62.670
1997-01-01	66.958
1997-04-01	68.468
1997-07-01	72.364
1997-10-01	73.526
1998-01-01	74.708
1998-04-01	76.694
1998-07-01	77.799
1998-10-01	77.615
1999-01-01	78.450
1999-04-01	76.696
1999-07-01	76.802
1999-10-01	78.175
2000-01-01	82.942
2000-04-01	80.796
2000-07-01	79.563
2000-10-01	82.126
2001-01-01	82.259
2001-04-01	80.540
2001-07-01	76.869
2001-10-01	79.215
2002-01-01	79.034
2002-04-01	77.704
2002-07-01	75.728
2002-10-01	78.330
2003-01-01	77.548
2003-04-01	80.359
2003-07-01	84.527
2003-10-01	92.962
2004-01-01	92.108
2004-04-01	92.259
2004-07-01	98.660
2004-10-01	106.077
2005-01-01	105.708
2005-04-01	110.498
2005-07-01	120.652
2005-10-01	127.427
2006-01-01	127.558
2006-04-01	128.003
2006-07-01	134.726
2006-10-01	139.796
2007-01-01	143.250
2007-04-01	149.283
2007-07-01	160.624
2007-10-01	173.513
2008-01-01	196.296
2008-04-01	179.101
2008-07-01	180.008
2008-10-01	168.738
2009-01-01	180.741
2009-04-01	193.286
2009-07-01	192.254
2009-10-01	208.940
2010-01-01	206.021
2010-04-01	207.597
2010-07-01	229.991
2010-10-01	242.332
2011-01-01	243.988
2011-04-01	257.588
2011-07-01	247.924
2011-10-01	255.609
2012-01-01	276.280
2012-04-01	277.814
2012-07-01	306.507
2012-10-01	315.418
2013-01-01	324.746
2013-04-01	316.339
2013-07-01	324.618
2013-10-01	326.238
2014-01-01	321.880
2014-04-01	329.885
2014-07-01	318.473
2014-10-01	330.126
2015-01-01	328.820
2015-04-01	332.178
2015-07-01	324.923
2015-10-01	328.483
2016-01-01	344.674
2016-04-01	354.447
2016-07-01	361.089
2016-10-01	364.618
2017-01-01	369.674
2017-04-01	374.060
2017-07-01	390.267
2017-10-01	404.572
2018-01-01	415.249