Year	% (modeled ILO estimate)
1991	45.831
1992	46.249
1993	46.299
1994	46.321
1995	46.396
1996	46.455
1997	46.481
1998	46.343
1999	46.272
2000	46.217
2001	46.325
2002	46.032
2003	45.896
2004	49.091
2005	47.528
2006	45.978
2007	44.441
2008	42.92
2009	41.416
2010	39.932
2011	38.469
2012	37.028
2013	35.61
2014	34.214
2015	34.101
2016	33.968
2017	33.817
2018	33.652
2019	33.339
2020	33.029
2021	32.958
2022	32.977
2023	32.865