77% (1983)

56% (1986)

66% (1982)

63% (1983)

56% (1985)

65% (1985)

55% (1982)

47% (1980)

70% (1985)

50% (1985)

50% (1982)

64% (1984)

72% (1987)

72% (1982)

67% (1981)

52% (1982)

90% (1984)

0% (1981)

0% (1983)

0% (1982)