Year	% of total labor force
1991	0.5047647994335097
1992	0.45532600431256776
1993	0.4422506995385488
1994	0.45795173454197197
1995	0.6479648017625695
1996	0.6663009828678403
1997	0.6517857265678841
1998	0.6392333124936569
1999	0.619975571475615
2000	0.6166943686821983
2001	0.6083640508133521
2002	0.6130366890634255
2003	0.6052456391786238
2004	0.5853608146845221
2005	0.5813322253825037
2006	0.5985246869897682
2007	0.5969623653724336
2008	0.5955503483552096
2009	0.5694060642891862
2010	0.5715422882955927
2011	0.5591000648202451
2012	0.554015120391972
2013	0.5571050910599213
2014	0.5546012983602226
2015	0.5483768772482412
2016	0.543436892804612
2017	0.5362420463813621
2018	0.5233047711068911
2019	0.4998185852639797
2020	0.5307475176861304