1961

8.0

1987

10.0

1985

8.8

1932

4.7

1985

5.9

1974

7.1

2009

8.0

2008

5.2

1961

6.8

1950

6.9

1951

6.3

1944

6.1

2009

6.9

1987

6.3

1999

6.6

1983

5.6

1983

6.0

1996

6.5

1981

5.8

2009

6.1