77% (2005)

74% (2011)

73% (2015)

68% (1990)

56% (1992)

62% (1981)

0% (1960)

75% (1995)

73% (2014)

68% (2009)

70% (1970)

68% (2019)

76% (2001)

66% (2013)

61% (1998)

77% (2006)

70% (2021)

61% (1971)

68% (2018)

63% (1998)