1942

7.8

1965

6.2

1996

7.2

2002

8.4

1993

8.6

1983

6.6

1981

6.0

1985

6.7

2010

5.0

2020

6.0

1981

6.2

2010

7.5

2005

6.9

1962

6.4

1960

6.3

1982

6.0

1949

6.6

1955

6.9

1965

6.4

2007

0.0