Year	% (modeled ILO estimate)
1991	30.052
1992	30.025
1993	30.173
1994	30.172
1995	30.168
1996	30.346
1997	30.212
1998	30.108
1999	29.916
2000	30.048
2001	29.923
2002	30.168
2003	30.108
2004	33.076
2005	31.501
2006	30.04
2007	28.651
2008	27.294
2009	25.961
2010	24.652
2011	23.407
2012	22.283
2013	21.225
2014	20.09
2015	22.019
2016	24.223
2017	26.616
2018	29.177
2019	28.562
2020	28.122
2021	28.086
2022	28.04
2023	28.124