Year	% of total population ages 15+ (national estimate)
1965	29.24
1971	49.83
1979	36.96
1981	60.5
1985	45.5
1987	45.88
1990	65.2
1991	65.22
1992	65.7
1993	65.7
1994	65.7
1995	65.7
1996	65.8
1997	65.8
1998	65.8
1999	65.8
2000	65.9
2001	65.71
2002	66.1
2003	66.2
2004	63.7
2005	48.3
2006	66.58
2010	72.06
2011	71.04
2015	71.57