76% (2011)

78% (1991)

78% (2008)

74% (1985)

77% (1997)

71% (1993)

68% (2004)

67% (1997)

78% (2001)

72% (1995)

80% (2012)

72% (2003)

65% (2000)

72% (2001)

65% (1999)

61% (2017)

57% (1963)

65% (1992)

78% (1991)

70% (1992)