Quarter	Millions of US Dollars
1966-01-01	20
1966-04-01	30
1966-07-01	45
1966-10-01	45
1967-01-01	60
1967-04-01	140
1967-07-01	140
1967-10-01	155
1968-01-01	309
1968-04-01	399
1968-07-01	504
1968-10-01	555
1969-01-01	640
1969-04-01	655
1969-07-01	665
1969-10-01	765
1970-01-01	765
1970-04-01	765
1970-07-01	765
1970-10-01	780
1971-01-01	1173
1971-04-01	1393
1971-07-01	1472
1971-10-01	1718
1972-01-01	2559
1972-04-01	3229
1972-07-01	4010
1972-10-01	5178
1973-01-01	6378
1973-04-01	7391
1973-07-01	7916
1973-10-01	8367
1974-01-01	9130
1974-04-01	9820
1974-07-01	10452
1974-10-01	12045
1975-01-01	14253
1975-04-01	16258
1975-07-01	17097
1975-10-01	20027
1976-01-01	24675
1976-04-01	27620
1976-07-01	30154
1976-10-01	33866
1977-01-01	35500
1977-04-01	37977
1977-07-01	40947
1977-10-01	45843
1978-01-01	49678
1978-04-01	52138
1978-07-01	57223
1978-10-01	58650
1979-01-01	60591
1979-04-01	63502
1979-07-01	68090
1979-10-01	68735
1980-01-01	65338
1980-04-01	71741
1980-07-01	71961
1980-10-01	71896
1981-01-01	71526
1981-04-01	70964
1981-07-01	75738
1981-10-01	81883
1982-01-01	82854
1982-04-01	83249
1982-07-01	85098
1982-10-01	91261
1983-01-01	93962
1983-04-01	95693
1983-07-01	96371
1983-10-01	97202
1984-01-01	102800
1984-04-01	102159
1984-07-01	102945
1984-10-01	106574
1985-01-01	115549
1985-04-01	122111
1985-07-01	136707
1985-10-01	144463
1986-01-01	159208
1986-04-01	181017
1986-07-01	197379
1986-10-01	207263
1987-01-01	226305
1987-04-01	238172
1987-07-01	250132
1987-10-01	274813
1988-01-01	272333
1988-04-01	270017
1988-07-01	282680
1988-10-01	298922
1989-01-01	303307
1989-04-01	325610
1989-07-01	344349
1989-10-01	367362
1990-01-01	377161
1990-04-01	384398
1990-07-01	407347
1990-10-01	424756
1991-01-01	417211
1991-04-01	427411
1991-07-01	456964
1991-10-01	488672
1992-01-01	478235
1992-04-01	503462
1992-07-01	511992
1992-10-01	489524
1993-01-01	484080
1993-04-01	474329
1993-07-01	502823
1993-10-01	495729
1994-01-01	515872
1994-04-01	526095
1994-07-01	532559
1994-10-01	522958
1995-01-01	548678
1995-04-01	551040
1995-07-01	526411
1995-10-01	526388
1996-01-01	523053
1996-04-01	522058
1996-07-01	521072
1996-10-01	526231
1997-01-01	515263
1997-04-01	533403
1997-07-01	540275
1997-10-01	529040
1998-01-01	529778
1998-04-01	546473
1998-07-01	561726
1998-10-01	586279
1999-01-01	592603
1999-04-01	623961
1999-07-01	672867
1999-10-01	689725
2000-01-01	692761
2000-04-01	735837
2000-07-01	760512
2000-10-01	809448
2001-01-01	840473
2001-04-01	885448
2001-07-01	924541
2001-10-01	950934
2002-01-01	947854
2002-04-01	1037049
2002-07-01	1026082
2002-10-01	1054234
2003-01-01	1073816
2003-04-01	1124401
2003-07-01	1150778
2003-10-01	1232490
2004-01-01	1221755
2004-04-01	1224020
2004-07-01	1232463
2004-10-01	1322746
2005-01-01	1294848
2005-04-01	1253668
2005-07-01	1229895
2005-10-01	1243133
2006-01-01	1281057
2006-04-01	1343465
2006-07-01	1367181
2006-10-01	1435551
2007-01-01	1465606
2007-04-01	1548428
2007-07-01	1591870
2007-10-01	1653857
2008-01-01	1723531
2008-04-01	1771962
2008-07-01	1692034
2008-10-01	1645820
2009-01-01	1646515
2009-04-01	1822300
2009-07-01	1900652
2009-10-01	1932018
2010-01-01	1903487
2010-04-01	1850618
2010-07-01	2000719
2010-10-01	2031981
2011-01-01	2142388
2011-04-01	2228701
2011-07-01	2173183
2011-10-01	2170967
2012-01-01	2282492
2012-04-01	2269530
2012-07-01	2395116
2012-10-01	2507276
2013-01-01	2528792
2013-04-01	2626228
2013-07-01	2759453
2013-10-01	2908423
2014-01-01	2943629
2014-04-01	3026748
2014-07-01	2979456
2014-10-01	2985928
2015-01-01	2904234
2015-04-01	3050615
2015-07-01	3055090
2015-10-01	3049960
2016-01-01	3170239
2016-04-01	3193777
2016-07-01	3232092
2016-10-01	3181870
2017-01-01	3276791
2017-04-01	3442996
2017-07-01	3599065
2017-10-01	3671047
2018-01-01	3760410
2018-04-01	3710198