Year	% (modeled ILO estimate)
1991	39.95
1992	37.399
1993	30.951
1994	35.526
1995	33.906
1996	33.852
1997	31.943
1998	31.442
1999	32.876
2000	27.753
2001	28.133
2002	28.654
2003	26.384
2004	24.473
2005	23.972
2006	22.947
2007	23.01
2008	23.924
2009	24.495
2010	25.16
2011	25.816
2012	25.002
2013	26.596
2014	27.469
2015	29.379
2016	30.174
2017	30.871
2018	31.041
2019	32.359
2020	27.436
2021	29.72
2022	31.008
2023	31.305