1935

6.5

1941

6.0

1937

4.0

1943

6.1

1950

7.0

1965

7.3

1969

6.9

1966

5.0

1953

5.8

1952

6.3

1952

6.0

1957

7.7

1963

5.9

1953

5.7

1961

7.4

1962

5.0

1959

5.9

1959

4.0

1967

6.0