1975

7.0

2018

8.1

1968

7.3

1971

7.7

1974

6.5

2017

6.1

1955

7.9

1986

7.7

2012

7.2

1963

7.5

1936

7.4

1977

6.6

2013

4.6

1933

7.2

1987

7.0

2001

5.2

1986

6.4

1967

6.9

1999

7.6