1971

6.8

2000

6.0

1990

7.0

1999

8.5

1995

8.0

0.0

1940

7.9

1983

7.2

1986

7.9

1972

8.7

1974

8.6

2005

6.7

1972

4.8

1997

7.4

1971

8.2

1986

7.5

1993

8.5

1995

6.6

1932

7.3

2017

6.2