Quarter	Millions of US Dollars
1966-07-01	15
1966-10-01	15
1967-01-01	30
1967-04-01	30
1967-07-01	30
1967-10-01	30
1968-01-01	30
1968-04-01	30
1968-07-01	30
1968-10-01	30
1969-01-01	30
1969-04-01	30
1969-07-01	30
1969-10-01	30
1970-01-01	30
1970-04-01	30
1970-07-01	30
1970-10-01	30
1971-01-01	30
1971-04-01	31
1971-07-01	32
1971-10-01	32
1972-01-01	32
1972-04-01	66
1972-07-01	86
1972-10-01	132
1973-01-01	188
1973-04-01	265
1973-07-01	294
1973-10-01	330
1974-01-01	406
1974-04-01	454
1974-07-01	610
1974-10-01	1052
1975-01-01	1459
1975-04-01	1714
1975-07-01	1681
1975-10-01	1748
1976-01-01	1897
1976-04-01	1969
1976-07-01	2147
1976-10-01	2500
1977-01-01	2761
1977-04-01	3114
1977-07-01	3585
1977-10-01	4236
1978-01-01	4729
1978-04-01	5061
1978-07-01	6054
1978-10-01	6373
1979-01-01	6467
1979-04-01	6735
1979-07-01	7441
1979-10-01	7416
1980-01-01	6795
1980-04-01	7967
1980-07-01	8259
1980-10-01	8059
1981-01-01	7821
1981-04-01	7578
1981-07-01	7979
1981-10-01	8909
1982-01-01	8806
1982-04-01	8633
1982-07-01	8545
1982-10-01	9213
1983-01-01	9141
1983-04-01	9229
1983-07-01	9311
1983-10-01	9029
1984-01-01	9547
1984-04-01	9327
1984-07-01	8977
1984-10-01	8923
1985-01-01	9160
1985-04-01	9644
1985-07-01	11004
1985-10-01	11449
1986-01-01	12779
1986-04-01	14386
1986-07-01	15735
1986-10-01	16077
1987-01-01	18845
1987-04-01	19091
1987-07-01	19193
1987-10-01	22629
1988-01-01	23894
1988-04-01	22854
1988-07-01	23106
1988-10-01	24490
1989-01-01	24328
1989-04-01	23958
1989-07-01	25009
1989-10-01	26367
1990-01-01	27542
1990-04-01	29311
1990-07-01	31789
1990-10-01	32367
1991-01-01	31664
1991-04-01	30666
1991-07-01	32689
1991-10-01	35496
1992-01-01	34771
1992-04-01	37984
1992-07-01	40954
1992-10-01	37093
1993-01-01	38194
1993-04-01	39131
1993-07-01	40405
1993-10-01	40284
1994-01-01	43777
1994-04-01	45299
1994-07-01	46617
1994-10-01	48394
1995-01-01	57342
1995-04-01	58290
1995-07-01	56507
1995-10-01	57042
1996-01-01	58674
1996-04-01	58469
1996-07-01	58524
1996-10-01	56951
1997-01-01	55563
1997-04-01	56259
1997-07-01	57001
1997-10-01	55081
1998-01-01	56225
1998-04-01	58064
1998-07-01	62585
1998-10-01	66765
1999-01-01	68250
1999-04-01	70071
1999-07-01	71638
1999-10-01	70372
2000-01-01	74199
2000-04-01	76800
2000-07-01	76050
2000-10-01	76817
2001-01-01	80925
2001-04-01	79991
2001-07-01	85306
2001-10-01	86240
2002-01-01	96067
2002-04-01	110892
2002-07-01	110072
2002-10-01	115395
2003-01-01	125988
2003-04-01	140187
2003-07-01	147285
2003-10-01	159526
2004-01-01	169024
2004-04-01	173817
2004-07-01	179584
2004-10-01	193338
2005-01-01	204271
2005-04-01	205757
2005-07-01	204043
2005-10-01	204101
2006-01-01	220006
2006-04-01	242459
2006-07-01	243811
2006-10-01	261942
2007-01-01	299308
2007-04-01	315990
2007-07-01	337806
2007-10-01	335889
2008-01-01	375823
2008-04-01	370102
2008-07-01	342086
2008-10-01	347468
2009-01-01	341549
2009-04-01	361862
2009-07-01	374788
2009-10-01	362685
2010-01-01	346756
2010-04-01	320108
2010-07-01	350914
2010-10-01	341389
2011-01-01	369005
2011-04-01	367846
2011-07-01	349911
2011-10-01	329175
2012-01-01	328070
2012-04-01	309214
2012-07-01	316582
2012-10-01	319832
2013-01-01	306864
2013-04-01	313230
2013-07-01	326910
2013-10-01	328231
2014-01-01	312544
2014-04-01	311202
2014-07-01	281579
2014-10-01	277391
2015-01-01	250957
2015-04-01	259444
2015-07-01	255884
2015-10-01	244437
2016-01-01	258334
2016-04-01	248091
2016-07-01	242113
2016-10-01	232283
2017-01-01	238872
2017-04-01	256127
2017-07-01	262963
2017-10-01	261659
2018-01-01	272241
2018-04-01	259323