Year	% of total population ages 15+ (national estimate)
1960	39.69
1966	38.04
1970	61.16
1978	41.33
1980	64.3
1983	64.01
1986	65.45
1987	66.54
1988	67.45
1989	68.6
1990	67.34
1991	65.19
1992	66.12
1994	67.47
1995	68.16
1996	67
1997	67.72
2003	69.25
2004	69.68
2009	66.96
2010	66.6
2011	67.59
2012	66.19
2013	66.71
2014	63.88
2015	63.963
2016	65.436
2017	64.375
2018	63.57
2019	62.295