Year	% of total population ages 15+ (national estimate)
1965	62.97
1970	57.38
1975	53.87
1980	60.51
1983	55.05
1985	62.52
1988	60.49
1995	67.96
1996	54.45
1997	55.08
2003	66.34
2005	69.62
2006	77.9
2007	77.4
2008	69.3
2009	76.42
2010	76.87
2011	77.1
2015	75.94
2016	73.84