57% (1963)

80% (2012)

78% (1991)

76% (2011)

74% (1985)

78% (1997)

72% (2003)

73% (1995)

78% (2008)

71% (1993)

66% (1997)

78% (2001)

64% (2000)

70% (1992)

61% (2017)

73% (2001)

65% (1992)

69% (2004)

76% (1997)

68% (1995)