Year	% of total labor force
1991	0.5809380447138556
1992	0.5547211061842406
1993	0.5110527599437923
1994	0.49955077064365255
1995	0.500670614226281
1996	0.5222917113090816
1997	0.4684045355475875
1998	0.44382301467559965
1999	0.4360506070547565
2000	0.42002536217376674
2001	0.3985375540851938
2002	0.3609047577617226
2003	0.3527522492107598
2004	0.40174915925500765
2005	0.3984624288933975
2006	0.35485554385271545
2007	0.3481568359506749
2008	0.34293045648973386
2009	0.3498076249673928
2010	0.3460445267132681
2011	0.3431392288204362
2012	0.3416891163318907
2013	0.33655716162135724
2014	0.3584395014627344
2015	0.3427960968576212
2016	0.33956585072262635
2017	0.35741061371522526
2018	0.35580465813167955
2019	0.3466877619749685
2020	0.35151730736961406