76% (1985)

75% (1981)

76% (1984)

65% (1984)

61% (1986)

63% (1980)

43% (1983)

62% (1983)

57% (1984)

62% (1984)

34% (1983)

50% (1985)

70% (1983)

50% (1988)

64% (1981)

43% (1985)

66% (1982)

57% (1984)

50% (1986)

0% (1985)