54% (1983)

58% (1983)

53% (1974)

58% (1979)

63% (1982)

50% (1976)

28% (1985)

53% (1984)

52% (1977)

40% (1976)

45% (1979)

68% (1979)

44% (1984)

47% (1984)

36% (1980)

35% (1985)