Year	% of total labor force
1991	35.24069652579665
1992	35.83542065007147
1993	36.95206958298363
1994	37.690633139933986
1995	36.82346060265768
1996	36.711623342469565
1997	36.89421247331545
1998	38.822786254313094
1999	39.27956597957263
2000	39.47448218052732
2001	39.69372884737163
2002	39.93599448578562
2003	40.232003760408276
2004	39.7230036142935
2005	40.185720514442544
2006	40.645209699992705
2007	40.51629729816686
2008	40.78357945941654
2009	41.056227873868664
2010	41.3381434827486
2011	41.12452540251151
2012	41.491379784841534
2013	42.09064857096048
2014	41.642863146955214
2015	41.235997499038454
2016	41.4785670840506
2017	41.06092807947843
2018	41.04496586128118
2019	41.198406276418
2020	41.0064001938555
2021	40.98986737701325
2022	41.075171874487445
2023	41.09896143430831