1974

6.7

1966

5.0

1959

3.7

1960

6.7

1967

6.6

1976

6.5

1961

7.7

1971

0.0

1955

6.9

1980

8.0

1968

9.5

1967

6.5

1971

6.3

1973

6.0

1971

7.6

1957

6.2

1964

0.0

1975

0.0