Year	% (national estimate)
1960	85.21
1970	62.89
1978	58.47
1979	57.94
1980	68.04
1990	60.27
1991	71.181
1992	72.229
1993	73.303
1994	72.636
1995	71.812
1996	71.104
1997	70.851
1998	71.076
1999	69.3
2000	67.677
2001	65.527
2002	62.55
2003	62.284
2004	62.411
2005	62.451
2006	62.986
2007	62.617
2008	62.171
2009	60.793
2010	61.191
2011	60.647
2012	60.731
2013	59.749
2014	58.84
2015	57.892
2016	57.177
2017	56.72
2018	56.606
2019	57.361
2020	51.201
2021	56.189
2022	56.171
2023	55.875