Year	% (modeled ILO estimate)
1991	49.275
1992	52.273
1993	55.092
1994	57.248
1995	58.425
1996	58.402
1997	58.008
1998	57.263
1999	56.703
2000	55.807
2001	51.96
2002	51.204
2003	48.892
2004	44.221
2005	46.081
2006	43.93
2007	37.26
2008	33.81
2009	37.78
2010	41.67
2011	32.24
2012	32.412
2013	33.743
2014	34.615
2015	36.261
2016	39.222
2017	41.175
2018	43.068
2019	46.43
2020	45.583
2021	46.825
2022	46.313
2023	46.268