Year	% of people ages 15 and above
1981	92.8097686767578
1991	96.4949722290039
2004	97.1651229858398
2005	97.7506866455078
2006	97.7521362304688
2007	97.9388427734375
2008	97.6306076049805
2009	97.6792678833008
2010	97.7489013671875
2011	97.7837524414062
2012	97.8945388793945
2013	98.0791320800781
2014	98.0937194824219
2015	98.1432571411133
2016	98.2505111694336
2018	98.4365005493164
2020	98.5944595336914