82% (1986)

72% (1976)

81% (1979)

65% (1982)

66% (1978)

77% (1987)

77% (1982)

63% (1979)

67% (1976)

72% (1990)

63% (1978)

50% (1974)

67% (1974)

50% (1989)

80% (1982)

67% (1977)

70% (1979)

85% (1985)

70% (1986)

70% (1975)