64% (1983)

66% (1982)

77% (1983)

65% (1985)

56% (1986)

72% (1987)

56% (1985)

70% (1985)

55% (1982)

67% (1981)

72% (1982)

64% (1984)

60% (1982)

0% (1981)

50% (1982)

47% (1980)

50% (1985)

0% (1982)

0% (1981)

60% (1983)