2005

6.9

1940

7.4

1992

7.6

1938

7.1

1991

6.2

1990

6.7

1993

5.5

1977

7.2

1986

6.8

1967

7.3

1994

6.2

1976

7.3

1985

6.5

1997

7.5

1973

7.3

1955

7.1

2000

7.2

2008

6.5

1995

6.9

2001

7.0