2005

7.2

1984

7.2

2002

7.5

1987

6.5

2000

7.8

1971

8.2

1932

7.4

1984

7.7

1956

7.7

1999

7.4

1967

7.5

2001

6.8

1990

7.0

1992

8.1

1989

6.3

1993

6.2

1980

7.7

1993

7.8

1973

6.2

1960

6.4