68% (2010)

54% (2002)

69% (1971)

62% (1944)

60% (1935)

62% (1976)

69% (1945)

60% (2010)

59% (1992)

62% (1988)

60% (1978)

42% (1996)

68% (1971)

69% (1944)

70% (2012)

70% (2010)

61% (1982)

65% (1980)

63% (1965)

62% (1976)