Year	% (national estimate)
1981	50.849764934465846
1983	50.63479960894872
1984	52.99006415482632
1985	52.31176552068959
1986	52.17511665330206
1987	52.74329735545971
1988	52.23138650632196
1989	51.26855469074967
1990	51.019393043406296
1991	49.593927791288614
1992	47.584814847844214
1993	45.98270153156127
1994	44.808471138676396
1995	43.71594286067545
1996	42.802035146205505
1997	42.525211393337784
1998	43.16874778895646
1999	43.96321993518707
2000	44.07663741878455
2001	43.62627435960875
2002	43.738225032421866
2003	43.48049061643327
2004	43.20010027440925
2005	42.87785244663591
2006	42.95270061151626
2007	43.21280290483984
2008	43.36091273626368
2009	42.522064655282925
2010	41.50291402575669
2011	40.83965609514126
2012	40.46362280138126
2013	40.52661037491969
2014	39.77292111901123
2015	39.305046795128625
2016	39.243167670612344
2017	39.37552907713941
2018	39.54917333292661
2019	39.64875208793377
2020	38.03632479867292
2021	40.48586433511045
2022	41.81811443251334
2023	42.80480587605615