39% (1982)

74% (1978)

27% (1979)

57% (1985)

42% (1982)

52% (1978)

54% (1987)

53% (1977)

45% (1980)

58% (1978)

59% (1977)

50% (1979)

50% (1984)

72% (1988)

63% (1977)

64% (1978)

53% (1979)

58% (1977)

72% (1981)

58% (1979)