Year	% of total labor force
1991	21.53414723406318
1992	21.665117639756556
1993	21.831247014626275
1994	22.017938925665952
1995	22.22804720069637
1996	22.445506197924477
1997	22.690444130822847
1998	22.959117589249033
1999	23.22695560100879
2000	23.4892480828073
2001	23.710921751009366
2002	23.949161781302784
2003	24.19366117946407
2004	24.435127103727314
2005	24.68294073280475
2006	24.907630076786937
2007	25.442617546311325
2008	26.003260512465552
2009	26.56177793363207
2010	27.06945200683681
2011	27.562708666347095
2012	28.054829589093107
2013	28.55936995111587
2014	29.070110680507216
2015	29.586567724561764
2016	30.09695822345205
2017	31.72092921735212
2018	31.885190267491343
2019	32.027998345994604
2020	32.056992863374674
2021	32.77770739477508
2022	32.3679241119237
2023	32.42968714417348