48% (2007)

73% (1973)

74% (1968)

73% (1966)

62% (1980)

69% (1961)

54% (1985)

60% (1968)

66% (1985)

74% (1965)

61% (1970)

62% (1977)

72% (1970)

80% (1957)

71% (1965)

71% (1968)

57% (1968)

62% (1970)

71% (2002)

63% (2007)