1931

7.2

1930

7.8

1960

8.4

1929

6.5

1953

7.7

1950

8.3

1963

8.1

1993

8.6

1957

8.2

1994

7.5

2006

5.8

1932

7.4

1927

7.5

1930

7.3

1935

7.5

1920

7.9

1959

8.1

1933

7.6

1956

7.7

1935

7.3