1976

7.2

1937

6.7

1936

6.8

1942

6.8

1936

7.1

1939

6.6

1939

6.4

1935

6.9

1934

6.9

1938

6.4

1935

6.5

1939

6.2

1935

6.6

1936

6.2

1936

6.8

1932

6.5

1934

8.0

1931

6.0

1937

6.5

1940

7.6