57% (1967)

53% (1986)

44% (1987)

55% (1982)

53% (1975)

41% (1985)

23% (1985)

52% (1985)

35% (1984)

62% (1983)

52% (1987)

57% (1987)

15% (1988)

40% (1983)

45% (1988)

40% (1981)

40% (1987)

30% (1987)

20% (1985)