Year	% of total labor force
1991	35.40549663623447
1992	35.23015161554351
1993	34.45508065649546
1994	34.52005442681757
1995	34.303060583350366
1996	34.534558943059395
1997	34.76627020477053
1998	34.99961276604733
1999	35.239280337144315
2000	35.422804901359804
2001	35.61337772320468
2002	35.812016294519175
2003	36.0169267700037
2004	36.30777999430037
2005	36.66798478409793
2006	37.02238570449129
2007	37.37826401292847
2008	37.73393847496001
2009	38.09340297145175
2010	38.46039633361708
2011	38.8328415440413
2012	39.19549924374856
2013	39.54109422185043
2014	39.873295701648594
2015	40.195658258405345
2016	40.5215544266868
2017	40.659562139420046
2018	41.07175984136734
2019	41.15551588428612
2020	41.08403407716176
2021	41.44740359897172
2022	41.559122521065106
2023	41.72481317188187