Year	% of total labor force
1991	1.4481722445940641
1992	1.4299825542128386
1993	1.5855403447634377
1994	1.5631136252537026
1995	1.7761427718379814
1996	1.9143334147816315
1997	1.9891206389961387
1998	1.9836170610499717
1999	1.9344303626710893
2000	1.918804990967844
2001	1.9700555983122703
2002	2.397967327287648
2003	2.611286216016304
2004	2.1091617261913145
2005	2.1057786227632316
2006	2.229439870833294
2007	2.2208962264375574
2008	2.2121279808747953
2009	2.2045470926050665
2010	2.1909722721733544
2011	2.169848328764427
2012	2.150572056357097
2013	2.1330464058635608
2014	2.115924898085184
2015	2.0988098838099667
2016	2.1174266003815534
2017	2.1371104225792177
2018	2.101399187770299
2019	2.142561354833846
2020	1.9242903545507055