Year	% (national estimate)
1992	44.293
1993	41.58
1994	38.15
1995	36.805
1996	34.462
1997	30.51
1998	27.201
1999	30.241
2000	30.908
2001	29.674
2002	30.704
2003	29.019
2004	28.958
2005	29.801
2006	29.444
2007	30.822
2008	31.779
2009	31.089
2010	30.327
2011	31.061
2012	29.753
2013	30.276
2014	29.457
2015	28.048
2016	27.524
2017	26.006
2018	25.1
2019	24.94
2020	23.453
2021	23.574
2022	22.114
2023	23.025