Year	% (national estimate)
1991	57.98
1992	58.64
1993	59.324
1994	58.718
1995	57.145
1996	58.131
1997	60.265
1998	60.364
1999	60.401
2000	60.06
2001	59.387
2002	56.204
2003	56.265
2004	56.534
2005	57.218
2006	57.988
2007	57.923
2008	57.614
2009	56.683
2010	56.497
2011	56.688
2012	57.478
2013	57.346
2014	56.928
2015	57.269
2016	57.442
2017	57.387
2018	57.677
2019	58.08
2020	53.052
2021	56.489
2022	57.803
2023	58.715