75% (1981)

76% (1984)

33% (1983)

50% (1984)

42% (1986)

44% (1988)

57% (1986)

69% (1982)

67% (1984)

63% (1984)

43% (1985)

63% (1986)

66% (1984)

62% (1984)

43% (1983)

57% (1984)

76% (1985)

63% (1980)

64% (1981)

50% (1984)