Year	% (modeled ILO estimate)
1991	35.799
1992	35.634
1993	35.591
1994	35.344
1995	35.377
1996	35.465
1997	35.137
1998	34.85
1999	34.608
2000	34.423
2001	34.071
2002	33.753
2003	33.016
2004	32.361
2005	31.619
2006	30.725
2007	29.88
2008	29.973
2009	30.142
2010	30.162
2011	30.278
2012	30.496
2013	30.524
2014	30.593
2015	30.586
2016	30.459
2017	30.273
2018	30.021
2019	29.761
2020	27.71
2021	28.34
2022	28.592
2023	28.609