70% (1958)

72% (1965)

52% (1987)

69% (1989)

53% (2003)

67% (1973)

70% (1955)

68% (1953)

71% (1940)

67% (2000)

69% (1968)

58% (1981)

57% (2001)

71% (1965)

72% (1971)

69% (1951)

61% (1999)

56% (1981)

65% (1957)

61% (1966)