Year	% (national estimate)
1997	38.124
1998	37.393
1999	35.319
2000	33.964
2001	32.654
2002	29.056
2003	27.311
2004	28.023
2005	24.917
2006	24.012
2007	24.376
2008	24.753
2009	24.51
2010	24.308
2011	23.369
2012	23.652
2013	22.935
2014	22.46
2015	24.499
2016	22.256
2017	24.465
2018	24.711
2019	24.665
2020	24.58
2021	21.186
2022	19.675
2023	18.659