Year	% (national estimate)
1997	44.12
1998	43.64
1999	43.29
2000	63.436
2001	62.529
2002	61.657
2003	60.794
2004	60.178
2005	59.409
2006	58.58
2007	58.2
2008	57.84
2009	57.71
2010	57.68
2011	57.5
2012	57.6
2013	57.8
2014	58.3
2015	58.7
2016	59
2017	59.2
2018	59.4
2019	57.816
2020	56.549
2021	57.558
2022	57.9