Year	% (national estimate)
1981	61.273181399900714
1983	59.6167864914748
1984	60.4248880380906
1985	59.990235277395776
1986	59.83434506423891
1987	59.58259228446873
1988	58.452645737076615
1989	58.27423526819388
1990	58.2501332289855
1991	57.499034875970665
1992	56.562015709664664
1993	55.784868166006376
1994	55.3464592558301
1995	54.73054038460715
1996	53.795698017151835
1997	52.58165863195798
1998	52.36937643530705
1999	53.21594470111154
2000	52.77432612018241
2001	51.99380754781514
2002	51.50496573407452
2003	50.497763218486824
2004	50.411289289396116
2005	50.09498430282941
2006	50.028137819290905
2007	49.772380630265644
2008	50.200987771382714
2009	48.05125372282087
2010	47.982933288989294
2011	47.7613062740129
2012	47.46521260815414
2013	46.98131482624658
2014	47.5505306111534
2015	47.45929888511838
2016	47.633524499921144
2017	47.035280996953105
2018	47.02743733661203
2019	47.12320104439594
2020	45.62080441926136
2021	46.822563602278905
2022	47.36054081358406
2023	47.65460202699718