Year	% of total labor force
1991	16.7467938334478
1992	17.16102401601067
1993	17.56893559583494
1994	17.97397115722828
1995	18.376263667673516
1996	18.78088021775347
1997	19.187695676720672
1998	19.592041563348683
1999	19.9866688466037
2000	20.36494325650952
2001	20.73184137747486
2002	21.055378934070053
2003	21.264461207009525
2004	21.25671717631719
2005	21.174031892634197
2006	21.11836530881454
2007	21.084524020627235
2008	21.07849722004711
2009	21.114499659222727
2010	21.30348172527282
2011	20.918327876653244
2012	20.7547385737787
2013	20.914169966544634
2014	21.4654489827797
2015	21.546416433764787
2016	21.201707319202104
2017	20.911268404862167
2018	21.000489194154305
2019	21.23210335859918
2020	21.218230614054402
2021	21.397127441878318
2022	21.52568995785269
2023	21.780753208519574