1956

5.5

1967

5.9

1977

5.5

1968

7.0

1952

4.9

1951

6.9

1974

6.3

1954

6.0

1976

6.7

1960

5.0

1952

6.1

1949

6.0

1975

6.0

1965

6.2

1955

6.4

1965

5.7

1971

6.5

1953

4.7

1970

3.7

1966

7.6

1963

5.8

1974

8.0

1969

6.9

1962

7.8

1971

7.0

1966

7.1

1970

3.3

1980

0.0

1966

7.1

1958

5.7

1973

5.2

1964

5.0

1975

6.7

1972

6.7

1968

6.7

1980

6.7

1974

5.4

1959

8.4

1952

5.7

1964

6.1