69% (1967)

76% (2001)

70% (1976)

75% (2005)

70% (1972)

68% (1968)

72% (1962)

78% (1969)

60% (1970)

60% (1979)

68% (1966)

58% (1972)

70% (1994)

68% (1977)

73% (1999)

62% (1975)

68% (1979)

55% (1979)

60% (1984)

55% (1974)