69% (1971)

49% (1983)

67% (1982)

52% (1980)

34% (1981)

50% (1976)

32% (1982)

55% (1981)

36% (1981)

30% (1979)

50% (1982)

65% (1972)

0% (1977)

52% (1981)

0% (1977)

0% (1965)

0% (1975)