77% (1983)

66% (1985)

66% (1982)

63% (1983)

69% (1981)

50% (1982)

72% (1982)

56% (1986)

72% (1987)

65% (1984)

56% (1982)

47% (1980)

70% (1985)

56% (1985)

60% (1983)

60% (1982)

64% (1984)

0% (1981)

88% (1985)

0% (1981)