73% (1952)

82% (1960)

73% (1979)

66% (1980)

64% (1988)

68% (1999)

69% (1976)

52% (1982)

77% (1971)

65% (1975)

79% (1976)

75% (1964)

74% (1973)

70% (1979)

70% (1996)

76% (1969)

60% (1975)

69% (1961)

70% (1963)

63% (1960)