Year	% (modeled ILO estimate)
1991	29.291
1992	29.789
1993	30.007
1994	29.858
1995	29.974
1996	30.098
1997	30.476
1998	30.696
1999	30.864
2000	30.938
2001	29.336
2002	31.391
2003	28.698
2004	29.643
2005	29.009
2006	28.207
2007	29.016
2008	29.688
2009	25.534
2010	27.848
2011	29.227
2012	30.856
2013	29.753
2014	29.091
2015	31.656
2016	32.088
2017	31.985
2018	32.626
2019	33.405
2020	27.746
2021	35.329
2022	35.135
2023	35.995