47% (1977)

47% (1983)

73% (1973)

69% (1976)

51% (1978)

64% (1976)

55% (1980)

60% (1982)

45% (1978)

54% (1978)

47% (1983)

27% (1986)

48% (1982)

34% (1977)

49% (1973)

48% (1983)

42% (1981)

43% (1982)

40% (1974)

32% (1983)