Year	% (modeled ILO estimate)
1991	36.434
1992	36.501
1993	36.504
1994	36.541
1995	36.482
1996	36.832
1997	36.893
1998	36.832
1999	36.683
2000	36.547
2001	36.727
2002	36.936
2003	37.16
2004	37.321
2005	37.399
2006	36.141
2007	34.906
2008	33.7
2009	32.496
2010	31.352
2011	30.234
2012	29.177
2013	29.283
2014	29.332
2015	29.265
2016	29.197
2017	29.026
2018	28.819
2019	28.559
2020	27.725
2021	27.875
2022	27.666
2023	27.932