Year	% (national estimate)
1987	41.113351951659595
1988	41.2879661021187
1989	41.6110659134097
1990	42.88639835072374
1991	41.464064630042785
1992	38.33287476173614
1993	35.549906484832825
1994	34.42414248118676
1995	33.640680954461764
1996	32.712992266143814
1997	32.96629276499557
1998	33.919549797907315
1999	34.273979255551865
2000	34.611783047099095
2001	34.9017524592637
2002	34.18271832423235
2003	33.55381912852223
2004	32.98128075851797
2005	32.54747930654035
2006	33.291056286790464
2007	34.366734358682564
2008	34.4770420650978
2009	32.2811695203508
2010	31.324708846519947
2011	30.69516582597754
2012	29.847254929498604
2013	29.694965385537255
2014	29.722937790083794
2015	30.120822158811315
2016	30.75164503844678
2017	31.79806187983979
2018	32.584780876572935
2019	33.09172122772496
2020	30.945334748346433
2021	32.559088810228076
2022	34.22319261682996
2023	34.91567825766324