77% (1981)

73% (1977)

58% (1975)

76% (1979)

74% (1976)

66% (1978)

73% (1984)

0% (1974)

66% (1985)

0% (1975)

74% (1983)

65% (1980)

71% (1986)

100% (1979)

68% (1990)

65% (1988)

64% (1983)

40% (1978)

74% (1984)

35% (1981)