1999

8.4

1972

7.1

2001

7.4

1995

6.6

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

1995

8.2

1977

7.1

1979

7.0

1959

7.9

1997

7.4

1995

7.7