62% (1976)

53% (1979)

50% (1984)

56% (1980)

55% (1979)

60% (1981)

44% (1983)

47% (1983)

0% (1977)

58% (1984)

47% (1982)

40% (1978)

70% (1983)

62% (1982)

33% (1978)

0% (1970)

35% (1980)

50% (1979)

53% (1984)

30% (1977)