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	1115
1971-04-01	1282
1971-07-01	1357
1971-10-01	1583
1972-01-01	2283
1972-04-01	2921
1972-07-01	3633
1972-10-01	4687
1973-01-01	5798
1973-04-01	6646
1973-07-01	7105
1973-10-01	7489
1974-01-01	8210
1974-04-01	8905
1974-07-01	9512
1974-10-01	11007
1975-01-01	13044
1975-04-01	14802
1975-07-01	15600
1975-10-01	18401
1976-01-01	22991
1976-04-01	25832
1976-07-01	27957
1976-10-01	31393
1977-01-01	32945
1977-04-01	35221
1977-07-01	37556
1977-10-01	41808
1978-01-01	45130
1978-04-01	47246
1978-07-01	51864
1978-10-01	52951
1979-01-01	54748
1979-04-01	57652
1979-07-01	61802
1979-10-01	62405
1980-01-01	59398
1980-04-01	65391
1980-07-01	65627
1980-10-01	65755
1981-01-01	65479
1981-04-01	64833
1981-07-01	69106
1981-10-01	74525
1982-01-01	75491
1982-04-01	75781
1982-07-01	77913
1982-10-01	83697
1983-01-01	86350
1983-04-01	88121
1983-07-01	88836
1983-10-01	89885
1984-01-01	95370
1984-04-01	94845
1984-07-01	95891
1984-10-01	99551
1985-01-01	107955
1985-04-01	114052
1985-07-01	128171
1985-10-01	136216
1986-01-01	150757
1986-04-01	172345
1986-07-01	188332
1986-10-01	198399
1987-01-01	217300
1987-04-01	229149
1987-07-01	241149
1987-10-01	265299
1988-01-01	262997
1988-04-01	261398
1988-07-01	274588
1988-10-01	290842
1989-01-01	295571
1989-04-01	318055
1989-07-01	336863
1989-10-01	359525
1990-01-01	367984
1990-04-01	374876
1990-07-01	397127
1990-10-01	413700
1991-01-01	406368
1991-04-01	415035
1991-07-01	443704
1991-10-01	473229
1992-01-01	462325
1992-04-01	486022
1992-07-01	492597
1992-10-01	468771
1993-01-01	462440
1993-04-01	449650
1993-07-01	470295
1993-10-01	455016
1994-01-01	469358
1994-04-01	476035
1994-07-01	479453
1994-10-01	468272
1995-01-01	495843
1995-04-01	497459
1995-07-01	470066
1995-10-01	467869
1996-01-01	461443
1996-04-01	453795
1996-07-01	449707
1996-10-01	444552
1997-01-01	429203
1997-04-01	438474
1997-07-01	434539
1997-10-01	422121
1998-01-01	419997
1998-04-01	431716
1998-07-01	446551
1998-10-01	470712
1999-01-01	477416
1999-04-01	505910
1999-07-01	552597
1999-10-01	568480
2000-01-01	568128
2000-04-01	608709
2000-07-01	632645
2000-10-01	684362
2001-01-01	716244
2001-04-01	757982
2001-07-01	795513
2001-10-01	817278
2002-01-01	812439
2002-04-01	897034
2002-07-01	889742
2002-10-01	915426
2003-01-01	933359
2003-04-01	983196
2003-07-01	1006064
2003-10-01	1081548
2004-01-01	1066443
2004-04-01	1067790
2004-07-01	1077105
2004-10-01	1165294
2005-01-01	1134113
2005-04-01	1092624
2005-07-01	1063300
2005-10-01	1073330
2006-01-01	1105223
2006-04-01	1162730
2006-07-01	1177883
2006-10-01	1235915
2007-01-01	1261679
2007-04-01	1322094
2007-07-01	1361821
2007-10-01	1413933
2008-01-01	1480915
2008-04-01	1521466
2008-07-01	1438682
2008-10-01	1398145
2009-01-01	1401988
2009-04-01	1565432
2009-07-01	1623455
2009-10-01	1635593
2010-01-01	1598070
2010-04-01	1532527
2010-07-01	1670335
2010-10-01	1684368
2011-01-01	1776712
2011-04-01	1840496
2011-07-01	1783007
2011-10-01	1765353
2012-01-01	1862866
2012-04-01	1841907
2012-07-01	1943088
2012-10-01	2033186
2013-01-01	2036149
2013-04-01	2104969
2013-07-01	2220745
2013-10-01	2343490
2014-01-01	2368284
2014-04-01	2425327
2014-07-01	2370489
2014-10-01	2363412
2015-01-01	2280598
2015-04-01	2398280
2015-07-01	2403349
2015-10-01	2402797
2016-01-01	2498942
2016-04-01	2522266
2016-07-01	2551229
2016-10-01	2493946
2017-01-01	2578010
2017-04-01	2729583
2017-07-01	2856611
2017-10-01	2914420
2018-01-01	2993567
2018-04-01	2930832