50063800 1967 51.6 520 1 19661122 8.40 1 19670428 50063800 1968 49.3 448 1 19680705 6.30 1 19680327 50063800 1969 69.0 1240 1 19690521 6.10 1 19681101 50063800 1970 66.0 1250 1 19691122 5.00 1 19700408 50063800 1971 76.6 1340 1 19701009 6.90 1 19710803 50063800 1972 43.7 490 1 19720903 6.50 1 19711006 50063800 1974 37.3 400 1 19731011 4.70 1 19740626 50063800 1975 42.4 1780 1 19750915 4.10 1 19750703 50063800 1976 52.7 655 1 19751209 8.00 1 19760903 50063800 1977 41.0 521 1 19770824 5.00 1 19770325 50063800 1978 50.7 1120 1 19771124 9.30 1 19780922 50063800 1979 98.6 1630 1 19790215 11.0 4 50063800 1980 54.2 1360 1 19791125 6.90 1 19800511 50063800 1981 67.7 751 1 19801207 9.60 1 19801119 50063800 1982 64.6 1150 1 19811214 6.60 1 19820629 50063800 1983 52.1 1060 1 19830705 6.70 2 50063800 1984 49.5 688 1 19831202 4.40 1 19840415 50063800 1985 68.8 794 1 19850514 5.90 1 19850710 50063800 1986 62.6 1170 1 19851115 8.40 1 19860726 50063800 1987 66.4 1330 1 19870412 8.00 1 19870314 50063800 1988 74.6 2600 1 19871207 9.10 1 19871103