Year	% (national estimate)
1980	53.637246393797476
1983	54.4312761892236
1984	55.195667401695516
1985	55.89128865588612
1986	55.328990020221035
1987	55.77386999876895
1988	56.259224590391874
1989	56.84367585988563
1990	57.161885325573735
1991	57.22567546847728
1992	56.95099407219246
1993	56.5435471356657
1994	56.55221944190258
1995	56.44334120651815
1996	56.496575388019565
1997	56.56485010045639
1998	56.57677082272152
1999	56.67731805057031
2000	56.76649677260261
2001	56.748572851984726
2002	56.189728527898104
2003	56.06964863175359
2004	55.968391389521834
2005	56.3438440920932
2006	56.80031706928355
2007	57.09682250360968
2008	57.01146789606082
2009	55.61487590172949
2010	55.403714115197644
2011	55.60933390354721
2012	55.68814025492092
2013	55.69901753888974
2014	55.97024637540908
2015	56.31325035883952
2016	56.738206282491056
2017	57.18607835799722
2018	57.61164101280605
2019	57.8265104454055
2020	55.39195340102113
2021	56.5710333634778
2022	57.860047429163394
2023	57.94353346538763