Year	% of total population ages 15+ (national estimate)
1966	40.68
1975	41.2
1977	36.71
1980	20.03
1983	17.99
1984	36.43
1985	38.08
1987	42.14
1996	44.92
1997	27.52
2000	27.02
2001	27.79
2008	41.7
2009	41.43
2010	41.71
2011	40.15
2012	42
2013	43.2
2014	41.151
2015	41.708
2016	41.871