1930

5.7

1939

6.4

1942

6.7

1960

4.3

1959

5.1

1962

6.6

1956

7.0

1941

6.2

1943

6.8

1963

5.9

1934

6.5

1949

5.7

1947

6.0

1940

6.7

1949

7.0

1951

7.8

1953

6.2

1954

5.8

1955

5.2

1956

6.0