Year	% (national estimate)
1998	57.3
1999	56.9
2000	60.11
2001	58.84
2002	56.77
2003	58.45
2004	56.59
2005	55.21
2006	53.8
2007	54.9
2008	52.3
2009	51.211
2010	52.262
2011	53.219
2012	54.278
2013	54.114
2014	55.891
2015	57.428
2016	57.064
2017	56.656
2018	55.836
2019	55.65
2020	55.96