Quarter	Millions of US Dollars
1966-01-01	15
1966-04-01	15
1966-07-01	15
1966-10-01	15
1967-01-01	15
1967-04-01	15
1967-07-01	15
1967-10-01	15
1968-01-01	125
1968-04-01	270
1968-07-01	340
1968-10-01	368
1969-01-01	458
1969-04-01	458
1969-07-01	458
1969-10-01	466
1970-01-01	466
1970-04-01	480
1970-07-01	480
1970-10-01	500
1971-01-01	740
1971-04-01	836
1971-07-01	946
1971-10-01	1196
1972-01-01	1569
1972-04-01	2070
1972-07-01	2169
1972-10-01	2416
1973-01-01	2612
1973-04-01	2718
1973-07-01	2876
1973-10-01	2943
1974-01-01	3048
1974-04-01	3056
1974-07-01	3059
1974-10-01	3199
1975-01-01	3258
1975-04-01	3418
1975-07-01	3371
1975-10-01	3499
1976-01-01	3773
1976-04-01	3835
1976-07-01	4131
1976-10-01	4458
1977-01-01	5118
1977-04-01	5729
1977-07-01	6278
1977-10-01	7179
1978-01-01	7599
1978-04-01	7698
1978-07-01	8424
1978-10-01	8896
1979-01-01	9501
1979-04-01	10483
1979-07-01	11000
1979-10-01	11449
1980-01-01	11426
1980-04-01	13121
1980-07-01	14327
1980-10-01	15595
1981-01-01	16642
1981-04-01	17293
1981-07-01	18943
1981-10-01	21137
1982-01-01	25091
1982-04-01	29556
1982-07-01	33223
1982-10-01	36989
1983-01-01	39553
1983-04-01	41951
1983-07-01	43567
1983-10-01	46579
1984-01-01	50712
1984-04-01	52765
1984-07-01	54284
1984-10-01	55935
1985-01-01	56894
1985-04-01	57653
1985-07-01	59980
1985-10-01	60404
1986-01-01	61774
1986-04-01	63584
1986-07-01	65518
1986-10-01	66809
1987-01-01	71033
1987-04-01	71992
1987-07-01	72802
1987-10-01	77256
1988-01-01	77442
1988-04-01	75732
1988-07-01	76923
1988-10-01	79793
1989-01-01	80502
1989-04-01	81572
1989-07-01	84651
1989-10-01	88145
1990-01-01	89812
1990-04-01	91120
1990-07-01	99947
1990-10-01	100928
1991-01-01	99325
1991-04-01	98013
1991-07-01	101620
1991-10-01	105324
1992-01-01	99303
1992-04-01	101918
1992-07-01	107828
1992-10-01	100654
1993-01-01	99664
1993-04-01	97282
1993-07-01	110137
1993-10-01	114326
1994-01-01	122515
1994-04-01	130360
1994-07-01	138844
1994-10-01	148114
1995-01-01	160808
1995-04-01	171285
1995-07-01	176837
1995-10-01	184837
1996-01-01	196705
1996-04-01	208539
1996-07-01	220990
1996-10-01	244577
1997-01-01	258773
1997-04-01	277961
1997-07-01	303247
1997-10-01	321744
1998-01-01	334579
1998-04-01	358579
1998-07-01	380541
1998-10-01	397769
1999-01-01	405370
1999-04-01	421845
1999-07-01	462833
1999-10-01	472035
2000-01-01	487189
2000-04-01	497206
2000-07-01	503174
2000-10-01	527791
2001-01-01	541116
2001-04-01	558565
2001-07-01	593745
2001-10-01	595471
2002-01-01	600232
2002-04-01	664843
2002-07-01	660953
2002-10-01	679154
2003-01-01	689752
2003-04-01	704275
2003-07-01	721710
2003-10-01	761758
2004-01-01	758577
2004-04-01	755889
2004-07-01	765941
2004-10-01	815951
2005-01-01	814362
2005-04-01	795028
2005-07-01	808813
2005-10-01	841358
2006-01-01	903532
2006-04-01	981701
2006-07-01	1059866
2006-10-01	1203438
2007-01-01	1313645
2007-04-01	1444924
2007-07-01	1518808
2007-10-01	1557827
2008-01-01	1579340
2008-04-01	1574308
2008-07-01	1533755
2008-10-01	1508879
2009-01-01	1470773
2009-04-01	1502103
2009-07-01	1521585
2009-10-01	1512938
2010-01-01	1500146
2010-04-01	1474507
2010-07-01	1531283
2010-10-01	1546066
2011-01-01	1564543
2011-04-01	1591373
2011-07-01	1578582
2011-10-01	1580979
2012-01-01	1623241
2012-04-01	1637706
2012-07-01	1683335
2012-10-01	1719467
2013-01-01	1731714
2013-04-01	1787245
2013-07-01	1810284
2013-10-01	1845730
2014-01-01	1875383
2014-04-01	1939446
2014-07-01	1965563
2014-10-01	1967655
2015-01-01	1982663
2015-04-01	2037820
2015-07-01	2033715
2015-10-01	2047785
2016-01-01	2059315
2016-04-01	2089806
2016-07-01	2116102
2016-10-01	2128666
2017-01-01	2185351
2017-04-01	2285643
2017-07-01	2361618
2017-10-01	2448583
2018-01-01	2546233
2018-04-01	2642595