1931

7.5

1964

5.0

1935

6.2

1933

6.2

1965

6.0

1961

7.0

1954

5.4

1947

7.4

1957

6.9

1962

4.0

1958

6.0

1967

6.7

1934

6.5

1953

6.0

1962

0.0

1957

6.0

1947

0.0

1952

5.7