Year	% of total population ages 15+ (national estimate)
1960	65.3
1970	60.86
1976	57.51
1977	47.32
1979	61.25
1980	49.05
1981	62.28
1982	69.64
1984	65.92
1985	65.72
1986	65.42
1987	64.9
1988	64.53
1989	64.56
1990	69.725
1991	68.243
1992	66.764
1993	65.895
1994	65.064
1995	61.106
1996	59.358
1997	60.138
1998	60.266
1999	62.97
2000	63.215
2001	63.285
2002	63.22
2003	62.829
2004	62.105
2005	62.226
2006	62.349
2007	61.202
2008	61.478
2009	60.491
2010	59.927
2011	59.925
2012	59.728
2013	59.141
2014	58.904
2015	58.958
2016	58.608
2017	58.856
2018	59.425
2019	59.349
2020	58.987
2021	60.413
2022	61.129
2023	61.106