1976 7.5

1976 7.4

1975 7.4

1975 8.0

1975 6.9

1975 8.1

1975 7.4

1974 6.7

1974 8.1

1974 7.2

1973 6.7

1973 6.8

1973 7.8

1973 6.4

1972 7.7

1972 7.2

1972 6.8

1972 7.4

1971 7.2

1971 5.0