68% (1979)

74% (2005)

78% (1969)

70% (1972)

70% (1976)

73% (1962)

70% (1967)

76% (2001)

68% (1966)

68% (1977)

65% (1975)

70% (1994)

74% (1999)

69% (1968)

68% (1969)

62% (2007)

59% (1972)

55% (1969)

59% (1984)

58% (1978)