64% (1964)

59% (1975)

72% (1998)

60% (1982)

54% (1972)

77% (1984)

69% (1984)

58% (2000)

76% (1982)

67% (1960)

57% (1948)

48% (2002)

70% (1986)

71% (1997)

62% (1971)

60% (2002)

76% (2001)

69% (1967)

61% (1965)

65% (1973)