Year	% of total population ages 15+ (national estimate)
1989	70.34
1990	73.594
1991	72.201
1992	69.726
1993	67.517
1994	67.193
1995	65.451
1996	64.731
1997	65.016
1998	60.066
1999	58.615
2000	58.934
2001	58.237
2002	57.216
2003	58.97
2004	59.066
2005	58.739
2006	60.637
2007	60.553
2008	61.106
2009	60.72
2010	60.5
2011	61.305
2012	61.311
2013	61.326
2014	61.12
2015	62.122
2016	62.988
2017	63.582
2018	63.853
2019	63.576
2020	63.516
2021	63.688
2022	65.644
2023	66.458