Year	% (modeled ILO estimate)
1991	45.778
1992	46.022
1993	46.287
1994	46.293
1995	45.871
1996	46.155
1997	46.222
1998	46.985
1999	47.179
2000	47.197
2001	47.208
2002	47.135
2003	46.743
2004	46.454
2005	46.196
2006	45.666
2007	45.315
2008	45.431
2009	45.311
2010	44.605
2011	44.214
2012	44.162
2013	44.095
2014	44.036
2015	41.927
2016	39.845
2017	37.8
2018	35.801
2019	33.853
2020	37.721
2021	35.898
2022	35.687
2023	35.831