76% (2011)

77% (1987)

78% (1991)

72% (1995)

71% (1993)

78% (1997)

72% (2003)

78% (2008)

82% (2012)

74% (1985)

72% (2001)

57% (2017)

77% (1988)

66% (1992)

70% (1992)

78% (2001)

78% (1997)

66% (2000)

68% (1997)

73% (2002)