Year	% (national estimate)
1986	33.5
1991	33.9
1996	40.14
2005	40.075
2006	39.435
2007	38.956
2008	37.037
2009	37.237
2010	35.905
2011	34.993
2012	35.581
2013	36.243
2014	35.931
2015	36.736
2016	37.213
2017	38.386
2018	38.656
2019	39
2020	36.982
2021	36.808
2022	36.852