1999

8.4

1972

7.1

2001

7.4

1990

7.8

2002

7.3

1972

7.8

1962

8.0

1940

7.8

1987

8.1

2004

7.9

1984

7.5

1996

8.0

1994

7.4

1977

7.1

1997

8.4

1944

6.8

2000

6.3

1991

7.0

1954

7.3

2002

6.9