Year	% (national estimate)
1991	64.586
1992	64.401
1993	65.151
1994	60.697
1995	59.035
1996	61.903
1997	62.328
1998	59.082
1999	65.415
2000	63.4
2001	63.209
2002	65.425
2003	62.311
2004	61.097
2005	58.827
2006	62.028
2007	59.702
2008	61.236
2009	62.353
2010	61.525
2011	62.534
2012	60.933
2013	61.182
2014	61.679
2015	62.578
2016	63.166
2017	62.356
2018	62.583
2019	61.556
2020	59.399
2021	58.562
2022	58.621
2023	59.405