1950

5.0

1974

6.2

1973

7.2

1992

6.3

1981

7.6

1965

7.0

1959

5.7

1968

6.6

1971

1.0

1971

6.5

1978

5.9

1960

7.5

1957

0.0

1973

5.2

1970

7.9

1959

8.4