Year	% (national estimate)
1991	58.12
1993	51.109
1994	52.112
1995	50.649
1996	49.444
1997	48.347
1998	49.05
1999	48.278
2000	46.097
2001	43.125
2002	40.063
2003	38.127
2004	35.844
2005	33.864
2006	33.53
2007	31.92
2008	31.143
2009	31.844
2010	30.879
2011	29.929
2012	31.27
2013	31.547
2014	32.199
2015	32.478
2016	31.98
2017	31.652
2018	30.406
2019	29.713
2020	27.305
2021	27.041
2022	27.675
2023	27.77