1929

7.5

1970

6.8

1972

7.4

1978

6.6

1935

7.3

1940

7.4

1988

7.3

1966

6.0

1951

6.1

1967

7.1

1936

7.0

1958

6.2

1958

6.1

1995

6.3

1971

7.7

1966

6.5

1987

7.1

1965

7.7

2004

6.3

2006

6.3