67% (1976)

78% (1987)

68% (1986)

79% (1964)

64% (1982)

74% (1984)

70% (1973)

62% (1974)

74% (1995)

65% (1954)

78% (1992)

72% (1990)

63% (1985)

71% (1984)

73% (1975)

84% (1992)

64% (1978)

72% (1989)

60% (1992)

66% (1997)