66% (1980)

72% (1993)

76% (1966)

63% (1980)

64% (1982)

74% (1991)

67% (1967)

71% (1981)

62% (1995)

73% (1967)

54% (2008)

68% (1986)

65% (1985)

60% (1970)

69% (1980)

73% (1973)

73% (1974)

70% (1976)

70% (1964)

66% (1971)