Year	% of total labor force (modeled ILO estimate)
1991	2.4066611020907347
1992	2.375263731843647
1993	2.6257431722976503
1994	2.921680081253309
1995	3.0045079865402617
1996	3.109396148027325
1997	3.2020861577583806
1998	3.3683579595027715
1999	3.460042631586772
2000	3.4162372075124092
2001	3.841966471801456
2002	4.158050118399451
2003	4.4075412792173525
2004	4.400436401057833
2005	4.477279686577166
2006	4.371182382652268
2007	4.350527832524737
2008	4.434062966970815
2009	4.419282242273675
2010	4.158348903690346
2011	4.109461875914499
2012	4.048577557042894
2013	4.0495140531861304
2014	4.0459145341909215
2015	4.120813186725233
2016	4.038120905249829
2017	3.9170826004754944
2018	3.808429779663946
2019	3.8989808076602515
2020	4.368402947299476
2021	4.12867163385659
2022	4.239945997476163
2023	4.000429358278477