75% (1981)

76% (1984)

70% (1983)

43% (1984)

50% (1984)

69% (1982)

62% (1984)

62% (1983)

76% (1985)

50% (1984)

50% (1988)

42% (1986)

63% (1986)

69% (1984)

43% (1985)

44% (1985)

50% (1985)

57% (1984)

57% (1986)

0% (1985)