64% (1978)

59% (1977)

74% (1978)

72% (1981)

51% (1978)

57% (1985)

50% (1979)

63% (1977)

53% (1979)

53% (1977)

58% (1979)

52% (1978)

60% (1985)

72% (1988)

50% (1978)

39% (1982)

45% (1982)

27% (1979)

49% (1980)

58% (1977)