Year	% of total population ages 15+ (national estimate)
1982	78.74
1990	79.17
2000	74.19
2001	76.46
2002	75.66
2003	74.99
2004	74.24
2005	74.24
2006	73.73
2007	73.18
2008	72.83
2009	72.46
2010	70.96
2011	70.84
2012	70.7
2013	70.68
2014	70.63
2015	70.69
2016	70.89