1960

8.4

2006

6.6

1999

6.5

1968

7.3

1980

8.2

1953

6.9

1962

7.3

1998

6.6

1949

6.0

2004

5.9

2007

6.3

1975

6.2

1991

7.5

2000

5.9

1993

7.5

2002

7.0

1955

7.3

1946

0.0

1956

7.6

2005

7.3