Year	% of total labor force
1991	18.770494814999054
1992	19.089110441767616
1993	19.287396696884276
1994	19.951020471328018
1995	20.6697352280033
1996	19.144180136355978
1997	17.751264404467708
1998	16.47851441880379
1999	18.345785884009878
2000	20.378884832578674
2001	20.12234131474718
2002	19.87628436869537
2003	19.640485099220232
2004	18.633635089141656
2005	17.65194344194354
2006	16.702505489645283
2007	15.983821574726717
2008	15.649285954855088
2009	15.323262346282363
2010	15.14626973012472
2011	17.15505649581035
2012	17.18555490689309
2013	17.24913292046308
2014	17.5432902860103
2015	17.794571968799506
2016	17.97870034333984
2017	18.13033921235555
2018	18.24106614035042
2019	18.313468435392334
2020	18.19410649361626
2021	18.41223553005319
2022	18.279863847399326
2023	18.44069387727308