Year	% of total labor force
1991	0.5041640801999011
1992	0.4666389835682103
1993	0.46086409683111074
1994	0.454126447210162
1995	1.6489535665632948
1996	1.6253477989872311
1997	1.2465644805600091
1998	1.1883897520947122
1999	0.42988524841756576
2000	0.3861531728334771
2001	0.35399932053264743
2002	0.3106477305474721
2003	0.2828442759453131
2004	0.2743018469391704
2005	0.2747401546865568
2006	0.4974942230294616
2007	0.29493232064356895
2008	0.29055629251670395
2009	0.3658568796035299
2010	0.3859397728261243
2011	0.3684590294142693
2012	0.2917491507915117
2013	0.3558770898784081
2014	0.3741834271271293
2015	0.35531160135413725
2016	0.3474164910413707
2017	0.3364690567073172
2018	0.3771316932514713
2019	0.37278418632913407
2020	0.38829634672472907