74% (2005)

68% (1979)

73% (1962)

70% (1976)

76% (2001)

70% (1972)

70% (1967)

78% (1969)

68% (1977)

64% (1975)

69% (1968)

74% (1999)

67% (1966)

70% (1994)

68% (1969)

63% (1963)

61% (1970)

59% (1972)

59% (1984)

50% (1976)