Year	% of people ages 15 and above
1986	75.6350402832031
1997	83.2621612548828
2004	88.9623870849609
2007	93.0825500488281
2008	93.9897308349609
2009	94.7242889404297
2010	96.2837371826172
2011	96.406867980957
2012	96.6785888671875
2013	97.4778518676758
2014	97.7466888427734