58% (1987)

57% (1967)

53% (1975)

30% (1985)

52% (1985)

52% (1987)

45% (1987)

52% (1986)

43% (1983)

55% (1982)

41% (1985)

37% (1984)

60% (1983)

42% (1981)

50% (1988)

40% (1987)

50% (1987)

22% (1985)

20% (1988)