1971

7.3

1975

8.0

1969

6.1

1965

6.7

1959

6.1

1983

7.9

1948

6.1

1953

4.5

1977

8.2

1965

5.7

1978

5.9

1953

5.0

1983

7.1

1954

6.5

1956

7.5

1963

5.4