1991

6.4

1984

6.4

1991

7.4

2007

6.0

2014

6.6

2001

6.2

1975

6.9

2005

6.2

2003

8.2

2020

5.7

2001

7.2

1962

6.5

1947

5.3

1985

6.3

1976

6.5

1950

6.4

1980

7.5

1970

6.7

1984

4.7

1916

0.0