2000

5.4

1967

6.0

1977

6.6

1963

7.2

1999

6.6

1973

7.5

2010

6.3

1997

6.2

1962

7.6

1953

7.6

1971

7.6

1977

8.0

1996

6.0

1990

5.8

1991

6.2

1921

7.8

1958

7.4

1965

7.2

1970

6.9

1972

6.7