Year	% of total population ages 15+ (national estimate)
1960	68.71
1970	57.55
1974	69.3
1975	71.23
1976	70.7
1978	71.84
1980	53.47
1981	72.43
1982	73.73
1985	52.71
1988	57.6
1990	69.41
1991	53.49
1994	68.01
1995	69
1996	67.8
1997	66.6
1998	65.34
1999	64.5
2001	62.9
2002	63.7
2003	61.87
2004	64.26
2007	65.1
2008	64.62
2009	62.529
2010	60.801
2011	60.842
2012	60.67
2013	60.894
2014	61.203
2015	63.153
2016	63.172
2017	63.733
2018	63.138
2019	64.349
2020	62.202
2021	62.843
2022	64.615