70% (1980)

42% (1982)

50% (1981)

75% (1989)

45% (1986)

71% (1982)

30% (1987)

66% (1984)

44% (1988)

58% (1982)

57% (1983)

43% (1985)

55% (1984)

50% (1988)

52% (1987)

0% (1986)

0% (1992)

53% (1975)

0% (1981)