Year	% (national estimate)
1997	42.134
1998	41.605
1999	38.825
2000	36.852
2001	35.345
2002	32.333
2003	31.361
2004	30.268
2005	28.166
2006	27.281
2007	28.329
2008	29.139
2009	28.268
2010	28.455
2011	26.828
2012	27.482
2013	26.989
2014	26.613
2015	29.383
2016	27.166
2017	28.357
2018	28.949
2019	29.834
2020	29.189
2021	26.016
2022	24.759
2023	23.423