63% (1983)

65% (1982)

55% (1986)

77% (1983)

47% (1980)

72% (1987)

64% (1984)

65% (1985)

56% (1985)

70% (1985)

55% (1982)

72% (1982)

67% (1981)

90% (1984)

50% (1982)

0% (1981)

50% (1985)

0% (1982)

0% (1983)

52% (1982)