77% (1983)

63% (1983)

65% (1982)

55% (1986)

50% (1985)

70% (1985)

72% (1982)

56% (1985)

65% (1985)

0% (1981)

50% (1982)

67% (1981)

55% (1982)

72% (1987)

0% (1981)

88% (1984)

47% (1980)

64% (1984)

52% (1982)

60% (1983)