Year	% of total labor force
1991	0.4609075847555204
1992	0.44761515872579943
1993	0.4350920172854333
1994	0.4115396998102802
1995	0.5738756255148031
1996	0.5624588209835688
1997	0.5581249773147732
1998	0.5670250290790456
1999	0.5246849473324691
2000	0.49825764167847
2001	0.4946990377186393
2002	0.480255849580282
2003	0.4698264310819125
2004	0.4437589752912267
2005	0.435758457604778
2006	0.42668986311440876
2007	0.4174025160682932
2008	0.40811956937221994
2009	0.4452364541853034
2010	0.4345931071484973
2011	0.41908597020706445
2012	0.41297417638788325
2013	0.4057436830611794
2014	0.3923674921043451
2015	0.38829581167948757
2016	0.3782278000449714
2017	0.35602283953997105
2018	0.35011120568413473
2019	0.343743147314031
2020	0.37011647518325425