Year	% (national estimate)
1997	37.77260129188353
1998	37.051499035387664
1999	33.85094182961176
2000	31.565973540195394
2001	30.378903817341527
2002	28.595875907396767
2003	28.108345634171428
2004	27.275125757777566
2005	27.16892592455029
2006	27.927042852741213
2007	29.72203145009958
2008	30.60162528654575
2009	28.661426037024622
2010	27.991252302784947
2011	27.154047234721883
2012	27.01413107924472
2013	27.07098979886943
2014	28.568476200991032
2015	29.669932090376125
2016	30.92913386736605
2017	32.14037250144861
2018	32.52470923076347
2019	32.74102674293429
2020	30.46278109326599
2021	29.183091261597923
2022	29.455750845246552
2023	28.85369535652072