72% (2023)

70% (2018)

75% (2015)

61% (2016)

66% (2011)

69% (2006)

58% (1990)

79% (1980)

73% (1979)

57% (2015)

56% (2011)

67% (1972)

71% (1967)

60% (1988)

76% (1969)

66% (1977)

67% (1974)

62% (1981)

63% (1974)

55% (2006)