Year	% of total labor force
1991	2.6837694097902545
1992	2.52607532315742
1993	2.42065420920367
1994	2.3369504253467164
1995	3.284581528159633
1996	3.561958600182073
1997	3.5469166575255318
1998	3.49008090777415
1999	3.2793173502942197
2000	3.2663123901169904
2001	3.6937228498745505
2002	3.754302513245694
2003	3.6002149605271048
2004	3.506652642985629
2005	3.3495583592630656
2006	3.470382727913178
2007	3.32033966077861
2008	3.269772505011606
2009	3.1724488196584355
2010	2.9071072247616643
2011	2.8749380279666266
2012	2.8279739869718235
2013	2.7682331807221234
2014	2.725425825358758
2015	2.735693949617456
2016	2.701465377641418
2017	2.7474111072835776
2018	2.7943274650784318
2019	2.8139692975753685
2020	2.798506869380328