1976

8.1

2000

8.0

1995

6.5

1971

6.8

1982

5.2

1932

7.0

2002

7.2

2006

7.4

1986

7.3

2003

7.2

1964

7.1

1993

6.2

1995

8.0

2000

6.7

1986

6.7

2008

7.8

1997

6.0

1996

6.0

1999

6.4

1963

7.7