1961

3.7

1980

5.7

1953

6.1

1972

7.1

1971

6.6

1969

6.6

1977

6.3

1988

6.4

1966

6.0

1962

5.0

1936

0.0

1972

5.7

1961

5.8

1959

6.7

1976

7.4

1964

7.2

1958

7.3

1956

7.8

1957

7.5