Year	% (national estimate)
1989	40.31
1994	40.52
1997	38.11
2005	39.642
2006	39.928
2007	40.189
2008	40.422
2009	40.33
2010	40.773
2011	38.541
2012	39.354
2013	39.868
2014	35.903
2015	39.93
2016	39.828
2017	39.774
2019	40.54
2022	38.805
2023	38.537