Year	% of total labor force
1991	28.907897846201568
1992	28.90209940169253
1993	28.85800787580775
1994	29.062492273581697
1995	29.450786355271447
1996	29.44798791685933
1997	29.432859681243485
1998	29.427567332069575
1999	29.96678971969176
2000	30.51267835143852
2001	31.061569350941703
2002	31.60939812239114
2003	32.157528063024834
2004	32.70658138219636
2005	33.247661173708586
2006	33.7785971682894
2007	34.3053052954687
2008	34.825882732640764
2009	35.3438686614858
2010	35.85647421298629
2011	36.36529330745559
2012	36.8724267089943
2013	37.37474904575189
2014	37.87346482875245
2015	38.13268100945946
2016	38.36348691435441
2017	38.572675684469985
2018	38.286329797461434
2019	37.97399745394653
2020	37.906001724375045
2021	38.39892287227579
2022	38.63149623187351
2023	38.70875336700956