Year	% of total labor force
1991	30.38414165519439
1992	30.8037532309404
1993	31.250920198179344
1994	31.708108063691004
1995	32.773893134549205
1996	32.829429511368375
1997	33.81471834085693
1998	33.733707634692564
1999	33.5068618369845
2000	33.886649826486234
2001	33.68430200465106
2002	34.01520828107905
2003	34.37647034733694
2004	35.01745857631848
2005	35.47577535081782
2006	36.027581080072196
2007	36.308829906891184
2008	36.32756335566213
2009	36.79384424135229
2010	36.767156657173174
2011	37.02976910517317
2012	37.480681438061445
2013	37.565438561591854
2014	37.07417175683023
2015	37.3549666820246
2016	37.45607140246971
2017	37.256113225865796
2018	37.53872432080536
2019	38.331203309197754
2020	38.012477421483446
2021	38.34177170903611
2022	38.907588676754855
2023	39.45317700758988