Year	% of total labor force
1991	33.138135207235344
1992	33.33779156858549
1993	33.56026089828915
1994	34.14743221080098
1995	34.42573135698457
1996	34.715121367048965
1997	35.00603303247458
1998	34.97267013428117
1999	35.26029816924184
2000	35.74588588157401
2001	36.22553390226298
2002	36.70090010373165
2003	37.02392012838175
2004	36.82848669554106
2005	37.3519234291112
2006	36.670471210124866
2007	37.15464593700118
2008	37.07692406009752
2009	37.59713283184374
2010	37.3133885651891
2011	36.953427037761024
2012	37.795450374991866
2013	38.509268004181266
2014	38.8739139919889
2015	39.53359254047999
2016	39.651913475389414
2017	40.01949552414374
2018	40.430669459003404
2019	41.43625218347991
2020	40.70073206093061
2021	40.756950422912446
2022	39.64807873294293
2023	40.14928122089383