Year	% (national estimate)
1991	50.22720263466255
1992	54.56572432410142
1993	54.97070140738375
1995	55.87811060642763
1996	57.107326546992226
1997	58.07653890503545
1998	58.35602374042776
1999	59.360722759329626
2001	61.92875727376217
2002	62.890333766079344
2003	64.03171767510787
2004	64.50070304730892
2005	65.34808043892477
2006	65.2790146955228
2007	65.83150119311088
2008	65.74743743197392
2009	66.77992997486938
2011	65.85090555943368
2012	66.15390405142237
2013	66.16558656148479
2014	65.90940283265654
2015	66.441055929729
2016	66.84883821937056
2017	67.62286316945962
2018	68.31256780765693
2019	69.18871458533629
2020	67.47495763178716
2021	68.28251303591347
2022	69.13541024468495
2023	69.55894901167217