Year	% (modeled ILO estimate)
1991	20.795
1992	21.083
1993	21.691
1994	22.454
1995	23.761
1996	24.869
1997	26.568
1998	27.725
1999	27.635
2000	27.611
2001	27.258
2002	26.718
2003	26.227
2004	25.657
2005	25.083
2006	26.847
2007	28.637
2008	30.446
2009	28.281
2010	26.054
2011	28.052
2012	30.051
2013	29.806
2014	29.619
2015	29.326
2016	29.102
2017	28.843
2018	31.409
2019	30.558
2020	33.138
2021	31.161
2022	28.409
2023	28.669