78% (1961)

60% (1995)

67% (1971)

59% (1977)

63% (1965)

69% (1973)

71% (1968)

72% (1981)

76% (2001)

63% (1962)

63% (1946)

69% (2002)

55% (1982)

67% (1980)

67% (1952)

63% (1987)

67% (1958)

59% (1956)

60% (1967)

79% (1982)