1974 7.7

1973 7.0

1972 7.9

1972 7.2

1971 5.0

1968 8.3

1967 7.9

1966 7.4

1965 6.9

1965 6.5

1963 8.4

1960 7.7

1960 8.5

1958 8.2

1957 8.4

1956 7.4

1955 8.1

1955 7.4

1955 7.0

1954 8.4