51% (1976)

58% (1982)

52% (1977)

63% (1982)

40% (1976)

57% (1979)

53% (1984)

53% (1982)

27% (1985)

52% (1974)

46% (1979)

47% (1984)

35% (1985)

44% (1984)

68% (1979)

36% (1980)