Year	% (modeled ILO estimate)
1991	29.313
1992	29.262
1993	26.468
1994	24.251
1995	24.025
1996	21.003
1997	20.931
1998	18.55
1999	18.566
2000	19.81
2001	20.766
2002	21.807
2003	22.709
2004	23.604
2005	24.493
2006	25.127
2007	25.71
2008	25.361
2009	24.78
2010	24.14
2011	24.943
2012	24.588
2013	24.17
2014	23.658
2015	23.216
2016	22.938
2017	22.312
2018	21.803
2019	21.378
2020	19.799
2021	19.824
2022	20.145
2023	20.311