58% (1977)

53% (1977)

58% (1979)

60% (1985)

58% (1978)

50% (1979)

50% (1984)

42% (1978)

43% (1977)

45% (1979)

57% (1982)

50% (1982)

52% (1979)

53% (1979)

64% (1978)

52% (1977)

47% (1989)

46% (1978)

50% (1978)

60% (1985)