Quarter	Billions of US Dollars
1980-10-01	34.051
1981-01-01	35.390
1981-04-01	38.112
1981-07-01	40.009
1981-10-01	43.329
1982-01-01	29.364
1982-04-01	28.908
1982-07-01	21.417
1982-10-01	10.335
1983-01-01	10.810
1983-04-01	12.234
1983-07-01	12.716
1983-10-01	13.746
1984-01-01	13.736
1984-04-01	15.561
1984-07-01	16.800
1984-10-01	19.478
1985-01-01	20.525
1985-04-01	21.090
1985-07-01	15.187
1985-10-01	13.804
1986-01-01	13.953
1986-04-01	12.134
1986-07-01	11.599
1986-10-01	11.496
1987-01-01	10.792
1987-04-01	10.938
1987-07-01	12.218
1987-10-01	12.151
1988-01-01	11.981
1988-04-01	14.772
1988-07-01	16.006
1988-10-01	21.772
1989-01-01	22.948
1989-04-01	27.347
1989-07-01	30.019
1989-10-01	36.756
1990-01-01	38.300
1990-04-01	43.260
1990-07-01	47.515
1990-10-01	55.944
1991-01-01	60.096
1991-04-01	68.215
1991-07-01	74.126
1991-10-01	85.558
1992-01-01	92.591
1992-04-01	103.536
1992-07-01	113.566
1992-10-01	125.646
1993-01-01	133.434
1993-04-01	140.996
1993-07-01	149.652
1993-10-01	157.899
1994-01-01	154.275
1994-04-01	163.519
1994-07-01	172.652
1994-10-01	121.818
1995-01-01	97.685
1995-04-01	103.481
1995-07-01	105.719
1995-10-01	97.835
1996-01-01	102.284
1996-04-01	104.744
1996-07-01	108.002
1996-10-01	105.135
1997-01-01	108.619
1997-04-01	108.345
1997-07-01	108.955
1997-10-01	107.233
1998-01-01	102.266
1998-04-01	99.114
1998-07-01	88.875
1998-10-01	87.932
1999-01-01	91.798
1999-04-01	93.581
1999-07-01	86.174
1999-10-01	86.238
2000-01-01	84.424
2000-04-01	79.737
2000-07-01	80.562
2000-10-01	77.770
2001-01-01	76.623
2001-04-01	77.517
2001-07-01	73.043
2001-10-01	73.883
2002-01-01	70.571
2002-04-01	64.325
2002-07-01	63.932
2002-10-01	65.780
2003-01-01	62.940
2003-04-01	63.460
2003-07-01	60.347
2003-10-01	60.282
2004-01-01	60.482
2004-04-01	60.168
2004-07-01	63.380
2004-10-01	69.995
2005-01-01	71.286
2005-04-01	78.094
2005-07-01	78.337
2005-10-01	87.377
2006-01-01	90.069
2006-04-01	92.806
2006-07-01	101.399
2006-10-01	112.290
2007-01-01	116.194
2007-04-01	126.312
2007-07-01	134.908
2007-10-01	143.126
2008-01-01	151.224
2008-04-01	163.010
2008-07-01	156.704
2008-10-01	128.706
2009-01-01	126.525
2009-04-01	134.026
2009-07-01	132.604
2009-10-01	137.278
2010-01-01	144.681
2010-04-01	141.445
2010-07-01	148.777
2010-10-01	155.871
2011-01-01	166.273
2011-04-01	173.485
2011-07-01	156.168
2011-10-01	160.303
2012-01-01	177.217
2012-04-01	174.333
2012-07-01	185.710
2012-10-01	189.834
2013-01-01	201.682
2013-04-01	195.969
2013-07-01	198.529
2013-10-01	207.779
2014-01-01	207.574
2014-04-01	214.636
2014-07-01	209.280
2014-10-01	198.582
2015-01-01	193.300
2015-04-01	194.711
2015-07-01	187.667
2015-10-01	190.584
2016-01-01	195.831
2016-04-01	189.090
2016-07-01	187.245
2016-10-01	183.260
2017-01-01	205.405
2017-04-01	219.551
2017-07-01	224.284
2017-10-01	214.337
2018-01-01	233.103