Year	% of total population ages 15+ (national estimate)
1970	48.63
1981	52.26
1986	56.37
1988	56.93
2004	52.3
2006	52.86
2007	53.77
2008	54.33
2009	55.6
2010	55
2011	55.58
2012	74.18
2013	72.9