23% (1985)

40% (1981)

40% (1983)

57% (1967)

30% (1987)

55% (1982)

41% (1985)

35% (1984)

57% (1987)

53% (1986)

52% (1987)

62% (1983)

20% (1985)

44% (1987)

15% (1988)

52% (1985)

55% (1975)

45% (1988)

40% (1987)