57% (1967)

54% (1982)

58% (1987)

41% (1985)

53% (1975)

52% (1986)

45% (1987)

37% (1984)

30% (1985)

52% (1985)

20% (1988)

52% (1987)

43% (1983)

61% (1983)

46% (1981)

50% (1988)

22% (1985)

40% (1987)

50% (1987)