Year	% (national estimate)
1991	32.542
1992	33.078
1993	33.643
1994	32.837
1995	31.565
1996	31.554
1997	32.859
1998	34.158
1999	34.231
2000	34.036
2001	32.313
2002	29.981
2003	29.409
2004	28.734
2005	31.51
2006	32.151
2007	32.213
2008	31.156
2009	29.633
2010	29.788
2011	29.726
2012	30.342
2013	29.528
2014	28.603
2015	28.477
2016	28.524
2017	28.37
2018	28.561
2019	29.805
2020	26.161
2021	29.791
2022	30.064
2023	31.506