1957

5.8

1958

5.6

1956

5.3

1977

6.3

1965

6.5

1985

5.6

1957

4.5

1955

5.5

1969

5.9

1962

6.0

1983

5.5

1961

7.7

1966

5.0

1963

8.2

1961

6.8

1959

0.0

1973

6.6