Year	% of total labor force
1991	20.810532099871285
1992	20.964584850691914
1993	21.215805941943678
1994	21.442358841857285
1995	21.589636854087928
1996	21.811305820012752
1997	21.940940105609357
1998	22.02879633452763
1999	22.176365738818223
2000	22.42862439747868
2001	22.59067604910861
2002	22.83845673443897
2003	23.158546491482195
2004	23.503370900427488
2005	23.853318395398222
2006	24.429152158247657
2007	25.02108792040662
2008	25.62961071840777
2009	26.232653957564285
2010	26.800281691588836
2011	27.11444414785118
2012	27.376283294113
2013	27.598415688547558
2014	27.82945039979951
2015	28.092978028847266
2016	28.24802748618222
2017	28.490464036300473
2018	28.77622878578034
2019	29.0393152498223
2020	28.93221936371278
2021	29.390923947621207
2022	29.131845403593275
2023	29.289727817689503