Year	% of total labor force
1991	32.473304183450566
1992	32.9771844332363
1993	33.42780891755626
1994	33.1270430670602
1995	32.82436001230304
1996	32.5194338892969
1997	32.21452115812918
1998	31.907488371593384
1999	31.59059583916625
2000	31.270029587725073
2001	30.948979925634347
2002	30.62723353616914
2003	31.1020863892112
2004	31.63830910050407
2005	32.18813727838134
2006	32.74403776503843
2007	33.30370700884472
2008	33.87006024290685
2009	34.44269432568638
2010	35.02477495930209
2011	35.61580996746262
2012	36.2131215367043
2013	36.91554192731266
2014	37.71781743097507
2015	38.51820508729702
2016	39.32138827645457
2017	40.12823726985806
2018	40.39739493651568
2019	40.25385058197492
2020	40.61335646633864
2021	41.256494973455325
2022	40.194966655916105
2023	40.40949152542373