Quarter	Billions of US Dollars
1974-04-01	18.323
1974-07-01	18.384
1974-10-01	21.392
1975-01-01	22.206
1975-04-01	23.111
1975-07-01	20.815
1975-10-01	22.210
1976-01-01	22.991
1976-04-01	23.851
1976-07-01	26.589
1976-10-01	29.719
1977-01-01	29.810
1977-04-01	32.140
1977-07-01	33.146
1977-10-01	37.735
1978-01-01	39.991
1978-04-01	40.571
1978-07-01	44.752
1978-10-01	49.586
1979-01-01	49.153
1979-04-01	51.750
1979-07-01	57.847
1979-10-01	61.652
1980-01-01	56.306
1980-04-01	65.042
1980-07-01	65.623
1980-10-01	62.221
1981-01-01	59.533
1981-04-01	54.052
1981-07-01	57.087
1981-10-01	61.042
1982-01-01	57.481
1982-04-01	57.281
1982-07-01	56.559
1982-10-01	61.130
1983-01-01	59.386
1983-04-01	57.393
1983-07-01	56.097
1983-10-01	55.400
1984-01-01	57.810
1984-04-01	55.268
1984-07-01	51.848
1984-10-01	52.185
1985-01-01	53.184
1985-04-01	54.702
1985-07-01	63.617
1985-10-01	71.370
1986-01-01	74.765
1986-04-01	80.643
1986-07-01	88.514
1986-10-01	96.819
1987-01-01	103.156
1987-04-01	103.841
1987-07-01	105.124
1987-10-01	126.897
1988-01-01	121.310
1988-04-01	114.099
1988-07-01	112.578
1988-10-01	124.222
1989-01-01	115.616
1989-04-01	116.099
1989-07-01	126.092
1989-10-01	144.110
1990-01-01	145.187
1990-04-01	153.142
1990-07-01	167.476
1990-10-01	181.314
1991-01-01	159.494
1991-04-01	156.177
1991-07-01	172.340
1991-10-01	194.854
1992-01-01	180.269
1992-04-01	199.267
1992-07-01	220.462
1992-10-01	196.878
1993-01-01	197.004
1993-04-01	191.240
1993-07-01	200.141
1993-10-01	190.883
1994-01-01	196.887
1994-04-01	210.890
1994-07-01	218.823
1994-10-01	223.445
1995-01-01	247.955
1995-04-01	252.829
1995-07-01	249.384
1995-10-01	256.476
1996-01-01	244.162
1996-04-01	245.031
1996-07-01	250.854
1996-10-01	249.635
1997-01-01	230.733
1997-04-01	231.597
1997-07-01	234.362
1997-10-01	234.548
1998-01-01	223.955
1998-04-01	234.816
1998-07-01	256.626
1998-10-01	261.698
1999-01-01	241.286
1999-04-01	236.127
1999-07-01	253.929
1999-10-01	247.285
2000-01-01	237.140
2000-04-01	245.805
2000-07-01	238.372
2000-10-01	254.085
2001-01-01	241.590
2001-04-01	233.802
2001-07-01	255.448
2001-10-01	251.486
2002-01-01	248.779
2002-04-01	287.459
2002-07-01	286.890
2002-10-01	307.101
2003-01-01	319.285
2003-04-01	336.947
2003-07-01	345.536
2003-10-01	383.608
2004-01-01	373.882
2004-04-01	377.710
2004-07-01	388.765
2004-10-01	428.893
2005-01-01	412.418
2005-04-01	398.863
2005-07-01	405.945
2005-10-01	400.935
2006-01-01	419.872
2006-04-01	452.854
2006-07-01	460.327
2006-10-01	480.038
2007-01-01	487.278
2007-04-01	511.134
2007-07-01	548.077
2007-10-01	586.377
2008-01-01	639.323
2008-04-01	642.875
2008-07-01	588.771
2008-10-01	582.472
2009-01-01	554.144
2009-04-01	586.707
2009-07-01	611.087
2009-10-01	601.753
2010-01-01	567.936
2010-04-01	525.988
2010-07-01	588.559
2010-10-01	582.858
2011-01-01	619.358
2011-04-01	638.589
2011-07-01	601.610
2011-10-01	582.756
2012-01-01	603.083
2012-04-01	576.239
2012-07-01	594.148
2012-10-01	603.204
2013-01-01	585.058
2013-04-01	597.742
2013-07-01	618.994
2013-10-01	654.390
2014-01-01	651.708
2014-04-01	652.650
2014-07-01	605.444
2014-10-01	574.215
2015-01-01	514.829
2015-04-01	530.743
2015-07-01	538.614
2015-10-01	530.924
2016-01-01	555.185
2016-04-01	542.886
2016-07-01	553.934
2016-10-01	530.807
2017-01-01	542.532
2017-04-01	578.375
2017-07-01	603.198
2017-10-01	616.655
2018-01-01	636.592