Year	% (modeled ILO estimate)
1991	60.222
1992	58.233
1993	55.537
1994	54.854
1995	55.888
1996	54.85
1997	56.059
1998	57.302
1999	57.38
2000	58.343
2001	56.39
2002	54.36
2003	52.334
2004	50.272
2005	48.207
2006	46.113
2007	44.022
2008	41.894
2009	39.812
2010	37.756
2011	37.743
2012	37.406
2013	37.153
2014	35.781
2015	35.214
2016	34.783
2017	34.561
2018	34.837
2019	34.349
2020	33.852
2021	33.348
2022	33.389
2023	33.224