Year	% (national estimate)
1991	68.131
1992	68.544
1993	65.442
1994	62.245
1995	62.667
1996	64.739
1997	63.543
1998	67.459
1999	64.053
2000	66.544
2001	64.672
2002	65.365
2003	64.575
2004	62.655
2005	60.947
2006	64.594
2007	65.397
2008	63.561
2009	60.85
2010	63.47
2011	63.958
2012	62.937
2013	62.912
2014	62.436
2015	60.592
2016	61.838
2017	63.87
2018	62.591
2019	60.78
2020	59.435
2021	60.617
2022	61.58
2023	62.621