Year	% of total population ages 15+ (national estimate)
1966	73.22
1977	67.2
1992	59.32
1995	67.17
1996	64.8
1997	66.002
1998	65.097
1999	64.941
2000	64.413
2001	63.177
2002	57.77
2003	55.928
2004	55.604
2005	53.938
2006	54.967
2007	54.769
2008	54.509
2009	54.44
2010	54.87
2011	54.111
2012	54.613
2013	54.533
2014	54.87
2015	54.544
2016	53.723
2017	54.939
2018	54.977
2019	55.14
2020	55.062
2021	51.069
2022	51.831
2023	51.471