74% (2005)

70% (1976)

73% (1962)

70% (1972)

70% (1967)

77% (1969)

76% (2001)

68% (1977)

68% (1979)

68% (1968)

74% (1999)

70% (1994)

63% (1975)

67% (1966)

60% (1970)

53% (1979)

58% (1972)

63% (1963)

59% (1984)

54% (1974)