50% (1983)

66% (1983)

71% (1985)

50% (1984)

37% (1983)

35% (1981)

48% (1984)

77% (1984)

53% (1985)

0% (1985)

58% (1986)

50% (1985)

62% (1987)

0% (1986)

63% (1983)

80% (1988)

61% (1982)