Year	% of total labor force
1991	3.2474594756884767
1992	2.2108994954966366
1993	2.158560881626271
1994	2.5698132602364225
1995	7.657228899164356
1996	7.4974087423069475
1997	6.9166119324960125
1998	6.770430994833809
1999	6.639098892746412
2000	6.502877435116042
2001	6.368154295791148
2002	6.235446800433342
2003	6.104607725757
2004	5.971934684626295
2005	5.835012972726516
2006	5.692845813904842
2007	5.552365695160489
2008	5.4225945643743945
2009	5.306601107603977
2010	5.199211137507657
2011	5.097328975926472
2012	5.001020735060951
2013	4.90835145925555
2014	4.817092282204744
2015	4.7291057594354085
2016	4.644431197482582
2017	4.559426827031251
2018	4.483954493592738
2019	4.402200007985386
2020	4.35767086883512