48% (1977)

46% (1983)

39% (1984)

73% (1973)

58% (1978)

56% (1980)

50% (1978)

58% (1982)

64% (1976)

68% (1976)

53% (1978)

46% (1978)

50% (1983)

58% (1964)

41% (1981)

34% (1977)

27% (1986)

48% (1982)

45% (1976)

39% (1983)