Quarter	Billions of US Dollars
1970-10-01	8.399
1971-01-01	7.836
1971-04-01	7.565
1971-07-01	7.692
1971-10-01	8.014
1972-01-01	8.530
1972-04-01	9.173
1972-07-01	9.925
1972-10-01	10.626
1973-01-01	12.315
1973-04-01	13.854
1973-07-01	14.234
1973-10-01	14.012
1974-01-01	14.385
1974-04-01	14.603
1974-07-01	13.706
1974-10-01	14.972
1975-01-01	16.293
1975-04-01	17.212
1975-07-01	16.399
1975-10-01	17.640
1976-01-01	18.267
1976-04-01	18.629
1976-07-01	19.329
1976-10-01	20.736
1977-01-01	21.032
1977-04-01	20.439
1977-07-01	20.784
1977-10-01	22.546
1978-01-01	22.004
1978-04-01	21.966
1978-07-01	23.623
1978-10-01	24.924
1979-01-01	24.856
1979-04-01	25.830
1979-07-01	27.902
1979-10-01	29.334
1980-01-01	29.059
1980-04-01	32.366
1980-07-01	33.145
1980-10-01	32.250
1981-01-01	31.286
1981-04-01	29.570
1981-07-01	30.470
1981-10-01	32.568
1982-01-01	32.113
1982-04-01	32.662
1982-07-01	33.321
1982-10-01	31.442
1983-01-01	31.500
1983-04-01	31.922
1983-07-01	32.343
1983-10-01	31.785
1984-01-01	33.899
1984-04-01	32.785
1984-07-01	31.802
1984-10-01	31.606
1985-01-01	33.115
1985-04-01	34.074
1985-07-01	38.768
1985-10-01	42.937
1986-01-01	45.872
1986-04-01	48.262
1986-07-01	51.191
1986-10-01	53.292
1987-01-01	58.052
1987-04-01	59.576
1987-07-01	62.600
1987-10-01	72.800
1988-01-01	72.962
1988-04-01	68.992
1988-07-01	68.568
1988-10-01	79.638
1989-01-01	80.726
1989-04-01	81.050
1989-07-01	86.540
1989-10-01	91.890
1990-01-01	98.366
1990-04-01	108.020
1990-07-01	121.433
1990-10-01	128.920
1991-01-01	116.546
1991-04-01	111.548
1991-07-01	122.047
1991-10-01	120.814
1992-01-01	117.476
1992-04-01	133.171
1992-07-01	130.194
1992-10-01	115.820
1993-01-01	100.274
1993-04-01	101.263
1993-07-01	96.127
1993-10-01	92.117
1994-01-01	98.339
1994-04-01	101.139
1994-07-01	110.905
1994-10-01	113.934
1995-01-01	121.962
1995-04-01	121.173
1995-07-01	118.939
1995-10-01	111.317
1996-01-01	105.118
1996-04-01	105.599
1996-07-01	107.925
1996-10-01	107.743
1997-01-01	103.823
1997-04-01	102.881
1997-07-01	104.994
1997-10-01	104.824
1998-01-01	101.440
1998-04-01	103.658
1998-07-01	110.813
1998-10-01	110.272
1999-01-01	107.312
1999-04-01	107.352
1999-07-01	109.807
1999-10-01	103.431
2000-01-01	102.003
2000-04-01	105.233
2000-07-01	104.817
2000-10-01	114.441
2001-01-01	110.735
2001-04-01	108.508
2001-07-01	115.890
2001-10-01	108.773
2002-01-01	116.958
2002-04-01	131.572
2002-07-01	128.480
2002-10-01	132.240
2003-01-01	138.268
2003-04-01	148.833
2003-07-01	152.244
2003-10-01	167.309
2004-01-01	165.670
2004-04-01	168.182
2004-07-01	171.985
2004-10-01	189.169
2005-01-01	182.109
2005-04-01	174.664
2005-07-01	172.930
2005-10-01	170.195
2006-01-01	182.225
2006-04-01	197.971
2006-07-01	201.028
2006-10-01	205.564
2007-01-01	213.825
2007-04-01	224.947
2007-07-01	240.123
2007-10-01	258.556
2008-01-01	281.305
2008-04-01	294.595
2008-07-01	277.759
2008-10-01	279.815
2009-01-01	274.325
2009-04-01	296.626
2009-07-01	289.202
2009-10-01	277.960
2010-01-01	267.727
2010-04-01	252.671
2010-07-01	282.483
2010-10-01	272.118
2011-01-01	293.145
2011-04-01	300.366
2011-07-01	283.274
2011-10-01	274.656
2012-01-01	288.473
2012-04-01	272.072
2012-07-01	279.577
2012-10-01	287.434
2013-01-01	290.457
2013-04-01	297.571
2013-07-01	308.095
2013-10-01	317.108
2014-01-01	315.555
2014-04-01	312.909
2014-07-01	288.884
2014-10-01	295.246
2015-01-01	272.425
2015-04-01	292.224
2015-07-01	299.471
2015-10-01	288.697
2016-01-01	299.081
2016-04-01	286.709
2016-07-01	283.489
2016-10-01	263.530
2017-01-01	276.443
2017-04-01	290.760
2017-07-01	300.841
2017-10-01	303.476
2018-01-01	315.424