62% (1964)

56% (2006)

70% (1991)

73% (1996)

65% (1986)

69% (1974)

69% (1995)

65% (1958)

63% (1977)

68% (1977)

65% (1980)

71% (2013)

72% (1997)

73% (1984)

70% (1950)

79% (2005)

69% (2013)

67% (2014)

52% (1957)

49% (2002)