69% (2000)

70% (1975)

68% (2006)

70% (1992)

67% (1983)

80% (1954)

66% (1985)

82% (1999)

75% (1964)

79% (1974)

65% (1948)

88% (1975)

65% (1955)

61% (1984)

59% (1987)

68% (2006)

67% (2000)

69% (1982)

69% (2002)

72% (1977)