Quarter	Billions of US Dollars
1974-04-01	13.144
1974-07-01	13.188
1974-10-01	15.345
1975-01-01	15.930
1975-04-01	16.579
1975-07-01	14.931
1975-10-01	15.932
1976-01-01	16.493
1976-04-01	17.109
1976-07-01	19.074
1976-10-01	21.319
1977-01-01	21.385
1977-04-01	23.056
1977-07-01	23.778
1977-10-01	27.069
1978-01-01	28.688
1978-04-01	29.104
1978-07-01	32.103
1978-10-01	35.571
1979-01-01	35.260
1979-04-01	37.123
1979-07-01	41.497
1979-10-01	44.227
1980-01-01	40.392
1980-04-01	46.659
1980-07-01	47.075
1980-10-01	44.635
1981-01-01	42.706
1981-04-01	38.774
1981-07-01	40.951
1981-10-01	43.789
1982-01-01	41.235
1982-04-01	41.091
1982-07-01	40.573
1982-10-01	43.852
1983-01-01	42.601
1983-04-01	41.171
1983-07-01	40.242
1983-10-01	39.742
1984-01-01	41.471
1984-04-01	39.647
1984-07-01	37.194
1984-10-01	37.435
1985-01-01	38.152
1985-04-01	39.241
1985-07-01	45.636
1985-10-01	51.198
1986-01-01	53.633
1986-04-01	57.850
1986-07-01	63.496
1986-10-01	69.454
1987-01-01	73.999
1987-04-01	74.491
1987-07-01	75.411
1987-10-01	91.030
1988-01-01	87.022
1988-04-01	81.850
1988-07-01	80.759
1988-10-01	89.111
1989-01-01	82.938
1989-04-01	83.285
1989-07-01	90.453
1989-10-01	103.378
1990-01-01	104.151
1990-04-01	109.857
1990-07-01	120.140
1990-10-01	130.067
1991-01-01	114.414
1991-04-01	112.035
1991-07-01	123.629
1991-10-01	139.780
1992-01-01	129.317
1992-04-01	142.946
1992-07-01	158.150
1992-10-01	141.232
1993-01-01	141.322
1993-04-01	137.187
1993-07-01	143.572
1993-10-01	136.931
1994-01-01	141.238
1994-04-01	151.283
1994-07-01	156.974
1994-10-01	160.290
1995-01-01	177.872
1995-04-01	181.369
1995-07-01	178.897
1995-10-01	183.423
1996-01-01	176.700
1996-04-01	174.213
1996-07-01	175.915
1996-10-01	178.790
1997-01-01	166.030
1997-04-01	163.649
1997-07-01	163.902
1997-10-01	165.191
1998-01-01	161.433
1998-04-01	168.168
1998-07-01	183.471
1998-10-01	187.389
1999-01-01	172.647
1999-04-01	167.225
1999-07-01	176.952
1999-10-01	174.458
2000-01-01	166.507
2000-04-01	169.948
2000-07-01	162.203
2000-10-01	174.305
2001-01-01	164.689
2001-04-01	161.747
2001-07-01	175.724
2001-10-01	171.321
2002-01-01	169.375
2002-04-01	194.863
2002-07-01	193.146
2002-10-01	205.753
2003-01-01	212.662
2003-04-01	223.861
2003-07-01	230.273
2003-10-01	250.313
2004-01-01	243.162
2004-04-01	243.250
2004-07-01	250.924
2004-10-01	278.041
2005-01-01	266.907
2005-04-01	270.128
2005-07-01	275.111
2005-10-01	273.137
2006-01-01	282.388
2006-04-01	303.263
2006-07-01	306.878
2006-10-01	319.960
2007-01-01	323.810
2007-04-01	334.361
2007-07-01	355.644
2007-10-01	373.144
2008-01-01	408.185
2008-04-01	411.855
2008-07-01	379.472
2008-10-01	376.402
2009-01-01	357.619
2009-04-01	379.207
2009-07-01	394.837
2009-10-01	388.584
2010-01-01	366.695
2010-04-01	339.741
2010-07-01	379.282
2010-10-01	375.363
2011-01-01	396.633
2011-04-01	410.756
2011-07-01	387.425
2011-10-01	372.087
2012-01-01	385.120
2012-04-01	365.188
2012-07-01	377.110
2012-10-01	382.450
2013-01-01	370.146
2013-04-01	377.765
2013-07-01	392.390
2013-10-01	398.919
2014-01-01	398.874
2014-04-01	397.062
2014-07-01	369.300
2014-10-01	344.275
2015-01-01	308.980
2015-04-01	320.746
2015-07-01	323.533
2015-10-01	314.352
2016-01-01	329.513
2016-04-01	322.144
2016-07-01	326.047
2016-10-01	308.397
2017-01-01	314.031
2017-04-01	337.539
2017-07-01	353.614
2017-10-01	363.785
2018-01-01	377.487