Year	% of total labor force
1991	0.31057058027007217
1992	0.5060267789371414
1993	0.317016293369414
1994	0.3160446381446916
1995	0.4422156774301963
1996	0.9435000707625053
1997	0.9823750720460199
1998	0.3576846701283965
1999	0.2335772166324189
2000	0.22835975796269442
2001	0.34052754527313717
2002	0.6976524531606876
2003	0.6704656280638345
2004	0.6336215173968098
2005	0.6245487035089549
2006	0.5234097384664285
2007	0.5183424915027173
2008	0.5116081565223296
2009	0.48090949603890876
2010	0.4733023658356829
2011	0.4661926005910434
2012	0.459416864361765
2013	0.4528907368747951
2014	0.3615221357877142
2015	0.35539589220884404
2016	0.3492380447599913
2017	0.36336769176729933
2018	0.33750261564527123
2019	0.34747317507088454
2020	0.34063735520073757