70% (1976)

74% (2005)

68% (1969)

78% (1969)

73% (1962)

71% (1972)

68% (1977)

76% (2001)

70% (1994)

70% (1967)

61% (1970)

69% (1968)

74% (1999)

68% (1979)

65% (1975)

67% (1966)

63% (1963)

59% (1984)

50% (1963)

55% (1973)