70% (1976)

73% (1962)

74% (2005)

68% (1979)

78% (1969)

70% (1972)

70% (1967)

76% (2001)

68% (1977)

70% (1994)

69% (1968)

74% (1999)

65% (1975)

68% (1969)

68% (1966)

55% (1969)

37% (1996)

50% (1963)

63% (1963)

62% (2007)