Year	% of total labor force
1991	37.76937661826133
1992	37.74608877207279
1993	37.898861972857176
1994	38.00797013720742
1995	38.112212928373566
1996	38.26475336966134
1997	38.50632565815372
1998	38.568978961055144
1999	38.87697684322899
2000	39.141135266462626
2001	39.08866774612289
2002	39.35106378772575
2003	39.54248947994511
2004	39.50648340082424
2005	39.63596054351072
2006	39.57827786684696
2007	39.41267019153469
2008	39.43712636733655
2009	39.465583413104454
2010	39.586140839392456
2011	39.54607668460722
2012	39.688249512335965
2013	39.53836325765397
2014	39.558063464142066
2015	39.753814382326446
2016	39.5160112912687
2017	39.43203275135901
2018	39.35734415546783
2019	39.5107216033939
2020	39.57218548745491
2021	39.873505794101796
2022	39.951425689993165
2023	40.192596842480114