1977 6.2

1977 7.3

1977 5.0

1977 7.2

1977 5.2

1977 5.1

1977 6.3

1976 7.5

1976 6.0

1976 5.8

1976 7.4

1975 8.1

1974 7.4

1973 7.5

1973 8.1

1972 7.4

1972 7.0

1971 5.0

1969 7.0

1968 8.0