Year	% (modeled ILO estimate)
1991	31.164
1992	29.873
1993	28.929
1994	29.305
1995	30.311
1996	31.232
1997	32.136
1998	32.468
1999	31.668
2000	30.887
2001	30.51
2002	29.879
2003	29.347
2004	28.727
2005	28.118
2006	30.416
2007	32.725
2008	35.012
2009	32.472
2010	29.871
2011	32.138
2012	34.404
2013	33.954
2014	33.525
2015	32.886
2016	32.326
2017	31.654
2018	33.867
2019	35.222
2020	36.898
2021	38.221
2022	35.819
2023	35.518