85% (1975)

85% (1976)

72% (1983)

74% (1991)

50% (1988)

65% (1977)

0% (1982)

83% (1991)

0% (1987)

53% (1985)

50% (1987)

65% (1985)

84% (1967)

71% (1978)

10% (1988)

0% (1982)

54% (1985)

70% (1979)

50% (1980)

63% (1980)