Year	% of total labor force
1991	0.583757144579793
1992	0.5356405715456026
1993	0.5403548628481506
1994	0.49822957264616435
1995	0.7658358817045039
1996	0.7280167616563252
1997	0.6939468850802865
1998	0.6826388459957445
1999	0.6895299750530377
2000	0.6960854121137621
2001	0.6483272674882007
2002	0.6169568599718009
2003	0.5750903860389146
2004	0.5340428399993729
2005	0.527316192368935
2007	0.4976542531944112
2008	0.4867023616276813
2009	0.4796816137081687
2010	0.5121284388632237
2011	0.5514323119457794
2012	0.538667562745922
2013	0.5205490729513806
2014	0.5068955458735765
2015	0.49983293106394305
2016	0.45521812080337004
2017	0.4416585402317719
2018	0.4422941378526233
2019	0.4549065043905344
2020	0.3962968992668928