1958

7.7

1979

5.8

1959

5.9

1969

6.5

1965

6.3

1973

5.7

1968

6.4

1959

6.2

1970

4.6

1967

6.6

1963

7.1

1962

6.5

1972

7.4

1979

6.7

1976

0.0

1977

8.2

1960

6.7