1969

7.6

1964

7.8

1955

6.0

1960

7.5

1968

6.8

2007

7.2

1966

5.6

1953

5.8

1946

7.4

1944

0.0

1929

6.5

1940

6.0

1943

0.0

1975

10.0

1985

7.2

1976

6.0

1999

5.3

2004

4.8

1945

8.0

1980

6.8