44% (1983)

62% (1976)

58% (1984)

60% (1981)

56% (1980)

47% (1982)

53% (1984)

49% (1984)

55% (1979)

47% (1983)

53% (1979)

62% (1982)

70% (1983)

35% (1980)

40% (1978)

30% (1977)

50% (1984)

66% (1981)

40% (1982)

50% (1979)