86% (1957)

85% (1966)

83% (1979)

84% (1975)

71% (1985)

70% (1962)

68% (1988)

76% (1960)

65% (2001)

80% (1963)

71% (1963)

73% (1976)

62% (1979)

69% (1982)

74% (1964)

66% (1967)

80% (1980)

56% (1995)

62% (2003)

69% (1968)