Year	% (national estimate)
1966	8.376905106240962
1976	20.356718192627827
1982	24.56564261880106
1986	27.293980128579783
1996	49.734714502273874
2005	44.64736565547823
2011	56.932441572104906
2014	54.39936775553213
2016	50.06883653271683