69% (1961)

59% (1991)

56% (2009)

57% (2018)

58% (2011)

58% (2015)

64% (1991)

59% (2020)

63% (2007)

68% (2006)

67% (1948)

66% (2001)

62% (1977)

63% (2011)

76% (1976)

56% (2018)

73% (1955)

72% (2023)

62% (2011)

61% (1997)