Year	% (national estimate)
1997	28.762123706000853
1998	29.278907548452242
1999	27.2849570987573
2000	25.981745690275332
2001	25.176213085812346
2002	22.919356185902753
2003	21.331974227098268
2004	21.38872645340661
2005	20.857008960914797
2006	21.4401816513607
2007	22.134747960419375
2008	22.57602688108932
2009	21.62786051057963
2010	20.70497557665581
2011	19.314891604317243
2012	19.47271293032788
2013	19.101332077331403
2014	20.36838872389426
2015	21.146144207724706
2016	22.1241604987156
2017	23.830743420037575
2018	24.328288344485387
2019	24.35076586888012
2020	21.866590426388488
2021	20.632955956152724
2022	21.301227893945555
2023	21.77503203044243