74% (1981)

76% (1984)

44% (1988)

42% (1986)

62% (1984)

66% (1982)

76% (1985)

67% (1984)

50% (1984)

50% (1988)

62% (1983)

57% (1984)

62% (1986)

57% (1984)

50% (1986)

63% (1980)

63% (1984)

43% (1983)

65% (1984)

0% (1985)