75% (2001)

71% (1936)

68% (1949)

72% (1955)

60% (1988)

62% (2003)

63% (1966)

65% (1976)

57% (1982)

71% (1964)

66% (1971)

68% (1954)

61% (2000)

69% (1919)

69% (1960)

63% (1933)

64% (1981)

59% (1955)

56% (2002)

59% (1983)