76% (2016)

72% (2023)

70% (2013)

68% (2013)

81% (2020)

77% (1997)

71% (2007)

69% (1983)

58% (1972)

60% (1994)

79% (2001)

69% (2024)

61% (1968)

50% (2005)

73% (2011)

50% (2006)

80% (2013)

65% (2007)

59% (2023)

74% (2025)