Year	% (modeled ILO estimate)
1991	31.35
1992	33.113
1993	33.387
1994	34.115
1995	35.387
1996	35.756
1997	36.145
1998	35.438
1999	39.895
2000	35.536
2001	31.038
2002	30.712
2003	30.652
2004	34.421
2005	34.094
2006	36.456
2007	38.818
2008	41.994
2009	41.874
2010	42.375
2011	37.76
2012	35.19
2013	35.027
2014	34.546
2015	28.982
2016	28.777
2017	26.903
2018	29.787
2019	31.044
2020	32.332
2021	33.833
2022	34.183
2023	34.455