69% (2004)

57% (2006)

73% (1961)

53% (2004)

60% (1989)

77% (1958)

64% (1980)

65% (1942)

65% (1975)

69% (1993)

62% (1991)

66% (2000)

59% (2003)

50% (1993)

53% (2006)

71% (1949)

80% (1982)

61% (2001)

60% (1986)

70% (1967)