1975

6.0

1966

5.2

1964

7.8

1978

3.5

1958

7.0

1955

6.5

1962

7.7

1955

6.1

1979

6.7

1965

5.6

1963

6.3

1961

6.8

1968

6.5

1957

6.2

1962

5.6

1966

6.0

1956

6.3