1950

7.7

1981

7.2

1990

7.3

1980

6.3

2003

8.1

1983

0.0

1987

6.4

2008

7.0

1955

7.0

2005

6.2

1923

0.0

1954

3.0

1992

7.5

1929

7.5

1919

0.0

1996

6.1

1988

7.3

2006

6.6

1987

6.6

2007

6.7