Year	% of total labor force
1991	0.38225593631236904
1992	0.36526437246629917
1993	0.3631131424240479
1994	0.3480774405677564
1995	0.3744340648707985
1996	0.36597640805171755
1997	0.3631544972460393
1998	0.37335807136066435
1999	0.37450329220901796
2000	0.36671868262263047
2001	0.372785267715496
2002	0.37584372331515153
2003	0.3771871016793489
2004	0.37699987166984444
2005	0.4080006099609119
2006	0.3773456750525454
2007	0.36177598702318503
2008	0.3626720592305217
2009	0.39181094037951203
2010	0.3931382427595356
2011	0.3951889499161071
2012	0.3965267492473051
2013	0.3950214825241386
2014	0.39379222779343404
2015	0.39326963374426627
2016	0.39131889135783726
2017	0.3882479343573598
2018	0.38187183410300163
2019	0.3780114313263808
2020	0.37881877629053107