63% (1976)

72% (1982)

74% (1982)

67% (1975)

71% (1982)

68% (1994)

68% (1977)

53% (1980)

72% (1979)

66% (1987)

68% (1975)

57% (1979)

67% (1978)

64% (1984)

55% (1989)

67% (1976)

80% (1978)

53% (1992)

67% (1979)

68% (1981)