Quarter	Billions of US Dollars
1976-01-01	9.619
1976-04-01	10.329
1976-07-01	10.960
1976-10-01	11.525
1977-01-01	11.965
1977-04-01	12.314
1977-07-01	12.612
1977-10-01	12.728
1978-01-01	13.177
1978-04-01	13.950
1978-07-01	14.662
1978-10-01	11.528
1979-01-01	12.082
1979-04-01	12.576
1979-07-01	13.365
1979-10-01	13.390
1980-01-01	13.435
1980-04-01	14.560
1980-07-01	15.710
1980-10-01	16.793
1981-01-01	17.376
1981-04-01	18.523
1981-07-01	20.104
1981-10-01	21.209
1982-01-01	22.098
1982-04-01	26.305
1982-07-01	25.472
1982-10-01	25.569
1983-01-01	26.057
1983-04-01	18.924
1983-07-01	19.865
1983-10-01	20.558
1984-01-01	21.551
1984-04-01	22.337
1984-07-01	22.757
1984-10-01	23.396
1985-01-01	23.436
1985-04-01	24.122
1985-07-01	25.536
1985-10-01	26.737
1986-01-01	27.331
1986-04-01	28.881
1986-07-01	24.011
1986-10-01	24.485
1987-01-01	26.083
1987-04-01	27.314
1987-07-01	28.037
1987-10-01	29.508
1988-01-01	31.593
1988-04-01	32.612
1988-07-01	34.104
1988-10-01	36.289
1989-01-01	37.289
1989-04-01	40.212
1989-07-01	43.711
1989-10-01	47.069
1990-01-01	50.764
1990-04-01	57.758
1990-07-01	62.815
1990-10-01	66.587
1991-01-01	67.314
1991-04-01	69.269
1991-07-01	68.984
1991-10-01	73.731
1992-01-01	74.635
1992-04-01	76.748
1992-07-01	80.114
1992-10-01	79.805
1993-01-01	78.948
1993-04-01	82.408
1993-07-01	84.484
1993-10-01	86.226
1994-01-01	89.522
1994-04-01	93.218
1994-07-01	98.176
1994-10-01	103.507
1995-01-01	106.298
1995-04-01	112.472
1995-07-01	117.675
1995-10-01	123.586
1996-01-01	125.805
1996-04-01	136.435
1996-07-01	144.526
1996-10-01	151.407
1997-01-01	155.541
1997-04-01	164.611
1997-07-01	144.107
1997-10-01	112.868
1998-01-01	87.569
1998-04-01	71.023
1998-07-01	79.599
1998-10-01	88.936
1999-01-01	69.663
1999-04-01	61.707
1999-07-01	54.561
1999-10-01	54.166
2000-01-01	49.563
2000-04-01	46.891
2000-07-01	47.583
2000-10-01	45.400
2001-01-01	44.808
2001-04-01	43.365
2001-07-01	46.840
2001-10-01	44.107
2002-01-01	45.114
2002-04-01	49.796
2002-07-01	50.745
2002-10-01	53.387
2003-01-01	54.641
2003-04-01	58.110
2003-07-01	59.669
2003-10-01	62.802
2004-01-01	61.269
2004-04-01	63.930
2004-07-01	67.723
2004-10-01	71.515
2005-01-01	74.015
2005-04-01	77.235
2005-07-01	78.227
2005-10-01	82.064
2006-01-01	86.345
2006-04-01	89.268
2006-07-01	92.988
2006-10-01	100.669
2007-01-01	100.338
2007-04-01	101.719
2007-07-01	107.761
2007-10-01	117.832
2008-01-01	125.027
2008-04-01	136.842
2008-07-01	144.884
2008-10-01	132.011
2009-01-01	123.775
2009-04-01	141.659
2009-07-01	152.000
2009-10-01	162.774
2010-01-01	165.171
2010-04-01	182.070
2010-07-01	191.803
2010-10-01	206.197
2011-01-01	216.099
2011-04-01	236.385
2011-07-01	243.474
2011-10-01	260.476
2012-01-01	272.492
2012-04-01	286.037
2012-07-01	293.235
2012-10-01	309.425
2013-01-01	311.691
2013-04-01	326.756
2013-07-01	306.262
2013-10-01	304.376
2014-01-01	324.678
2014-04-01	327.637
2014-07-01	330.638
2014-10-01	336.929
2015-01-01	323.392
2015-04-01	330.362
2015-07-01	311.989
2015-10-01	339.045
2016-01-01	352.935
2016-04-01	363.310
2016-07-01	370.226
2016-10-01	373.403
2017-01-01	375.734
2017-04-01	385.695
2017-07-01	384.913
2017-10-01	395.229
2018-01-01	392.597