Year	% of total labor force
1991	31.993715409230717
1992	32.160086500249605
1993	32.283994258414204
1994	32.40648562367421
1995	32.56823358873473
1996	32.70588715770558
1997	32.84746532937346
1998	32.98586498769962
1999	33.1190409944314
2000	33.25398289370213
2001	31.887826295453387
2002	32.89995325727541
2003	34.40298398088845
2004	34.20784841655573
2005	35.18363901606555
2006	35.568792359546464
2007	35.21199472759227
2008	35.980035312676385
2009	36.32320197440781
2010	37.19862629047693
2011	36.955469208030436
2012	37.153305594885474
2013	38.15898660434554
2014	38.221302618417575
2015	38.96962671147602
2016	38.62523468713078
2017	38.74789964181209
2018	39.08676219877436
2019	39.4982591738133
2020	39.310004094162274
2021	39.37261895699895
2022	39.08728082888402
2023	39.49877644586007