1978

3.9

1957

5.6

1959

6.6

1957

6.0

1955

6.5

1954

5.4

1955

7.6

1960

5.7

1983

7.2

1980

8.1

1961

7.3

1958

6.5

1952

8.0

1953

6.1

1972

4.0