Year	% (national estimate)
1991	50.22
1994	58.53
1997	50.7
1998	51.4
1999	46.06
2000	43.7
2001	44.6
2002	42.13
2003	40.49
2005	38.886
2006	41.945
2007	43.918
2008	43.215
2009	43.302
2010	41.32
2011	40.056
2012	40.456
2013	39.87
2014	39.48
2015	40.445
2016	39.646
2017	41.989
2018	40.808
2019	38.157
2020	37.943
2021	34.633
2022	35.962