Year	% of total labor force
1991	0.2948742379804653
1992	0.29054902143089584
1993	0.28610788842364565
1995	0.24234727880357998
1996	0.23866397271866224
1997	0.18458134936349638
1998	0.17503695591578675
1999	0.17220489523281615
2000	0.16935942831926104
2001	0.2579769262950597
2002	0.16020583729616075
2003	0.15577170921242706
2006	0.1456441869359322
2010	0
2011	0.0011862126034614632
2012	0.0011621968961439935
2013	0.0027295953647831243
2014	0.002671784618535951
2015	0.0026187202270605016
2016	0.004279866459606727
2017	0
2018	0.01030532195680751
2019	0.020284210182551807
2020	0.020126855545129847