57% (1967)

58% (1987)

46% (1987)

52% (1987)

53% (1975)

37% (1984)

52% (1986)

54% (1982)

42% (1985)

60% (1983)

43% (1983)

40% (1987)

42% (1981)

20% (1988)

52% (1985)

22% (1985)

30% (1985)

50% (1988)

50% (1987)