62% (1976)

49% (1984)

55% (1979)

58% (1984)

47% (1982)

53% (1979)

56% (1980)

50% (1984)

50% (1979)

60% (1981)

53% (1984)

62% (1982)

70% (1983)

44% (1983)

0% (1977)

0% (1970)

47% (1983)

34% (1978)

40% (1978)

40% (1982)