73% (2011)

76% (2010)

73% (1992)

75% (1997)

66% (1967)

69% (1950)

66% (1978)

56% (2007)

57% (2009)

76% (1999)

72% (1986)

63% (2005)

71% (2005)

72% (1989)

74% (2010)

66% (2021)

59% (2015)

65% (2015)

52% (2014)

62% (2012)