58% (1981)

32% (1984)

25% (1982)

32% (1989)

40% (1989)

51% (1987)

56% (1988)

45% (1976)

58% (1984)

57% (1975)

49% (1989)

39% (1988)

46% (1971)

62% (1985)

53% (1979)

64% (1970)

50% (1986)

0% (1979)

60% (1971)

66% (1989)