75% (1982)

60% (1984)

25% (1985)

57% (1988)

0% (1992)

72% (1986)

63% (1987)

60% (1985)

72% (1989)

0% (1984)

95% (1984)

0% (1989)

66% (1991)

20% (1987)

40% (1992)

60% (1986)

50% (1990)

75% (1990)

42% (1992)

40% (1988)