40% (1976)

50% (1976)

63% (1982)

52% (1977)

53% (1982)

58% (1982)

52% (1984)

47% (1979)

57% (1979)

27% (1985)

41% (1984)

52% (1974)

41% (1984)

68% (1979)

36% (1980)

27% (1985)