39% (1982)

52% (1978)

42% (1982)

27% (1979)

57% (1985)

74% (1978)

60% (1985)

53% (1977)

54% (1987)

54% (1990)

58% (1977)

72% (1981)

53% (1979)

50% (1979)

64% (1978)

59% (1977)

58% (1979)

51% (1978)

50% (1982)

50% (1984)