57% (1967)

58% (1987)

24% (1985)

52% (1985)

45% (1987)

54% (1982)

35% (1984)

40% (1985)

53% (1975)

53% (1986)

15% (1988)

51% (1987)

40% (1981)

41% (1983)

45% (1988)

61% (1983)

40% (1987)

20% (1985)

30% (1987)