Year	% (national estimate)
1987	36.83562448986614
1988	37.07120355574672
1989	37.532607740239364
1990	38.96741423429945
1991	37.70517800746402
1992	34.81699471946078
1993	32.22421997028141
1994	31.406032749751148
1995	30.246295751998492
1996	29.181769807597366
1997	29.24614100556864
1998	30.292065902098074
1999	30.76749632601595
2000	31.30071686174007
2001	31.615167707371356
2002	30.874675783742624
2003	30.40187104516714
2004	29.97250506742658
2005	29.426387279457494
2006	30.052052012163948
2007	31.17981173186667
2008	31.27957035920943
2009	29.98435838369897
2010	28.858038881823138
2011	28.360489762343917
2012	27.589516280347663
2013	27.460493756378302
2014	27.508442062220507
2015	27.986353104181884
2016	28.62764778554753
2017	29.74373352919985
2018	30.328236328610586
2019	30.691476514019023
2020	28.400426952009774
2021	30.166316093279548
2022	31.886719246753493
2023	32.69063381059497