81% (2005)

85% (2010)

82% (2010)

76% (2001)

80% (1997)

83% (1997)

77% (2009)

84% (1989)

85% (2011)

76% (2003)

65% (2013)

75% (2012)

87% (2013)

70% (1981)

69% (2012)

83% (2005)

78% (1995)

84% (2009)

77% (2020)

57% (2025)