Year	% (modeled ILO estimate)
1991	35.55
1992	36.251
1993	36.32
1994	36.774
1995	36.877
1996	36.875
1997	36.868
1998	36.869
1999	36.786
2000	36.718
2001	36.652
2002	36.647
2003	36.597
2004	36.504
2005	36.198
2006	35.869
2007	35.475
2008	34.85
2009	34.587
2010	34.142
2011	33.325
2012	32.666
2013	32.028
2014	31.351
2015	30.964
2016	30.582
2017	30.154
2018	29.733
2019	29.283
2020	27.77
2021	27.776
2022	29.436
2023	29.661