71% (2018)

75% (2015)

72% (2023)

65% (2011)

71% (1985)

60% (2016)

69% (2006)

69% (1982)

79% (1980)

73% (1979)

58% (1990)

57% (2015)

68% (1972)

56% (2011)

54% (2006)

76% (1969)

70% (1967)

62% (2004)

66% (1977)

60% (1988)