72% (1942)

71% (1951)

74% (1970)

74% (1949)

59% (1977)

47% (2007)

73% (1960)

70% (1973)

63% (2007)

53% (2004)

75% (1939)

62% (2000)

69% (1961)

72% (1966)

49% (2000)

80% (1982)

64% (2002)

60% (1989)

74% (1966)

52% (2015)