49% (2007)

73% (1973)

60% (1968)

75% (1968)

62% (1977)

62% (1980)

54% (1985)

73% (1966)

66% (1985)

74% (1965)

71% (1970)

71% (2002)

69% (1961)

63% (1966)

80% (1957)

72% (1965)

63% (2007)

72% (1968)

64% (1968)

50% (1974)