49% (1980)

45% (1980)

51% (1978)

53% (1977)

58% (1977)

74% (1978)

42% (1982)

50% (1982)

59% (1977)

64% (1978)

53% (1979)

60% (1985)

39% (1982)

57% (1985)

50% (1979)

72% (1981)

52% (1977)

63% (1977)

27% (1979)

72% (1988)