Year	% (modeled ILO estimate)
1991	36.35
1992	36.464
1993	36.554
1994	36.546
1995	36.619
1996	36.737
1997	36.663
1998	36.579
1999	36.441
2000	36.527
2001	36.48
2002	36.554
2003	36.461
2004	40.153
2005	38.513
2006	36.97
2007	35.485
2008	34.027
2009	32.59
2010	31.175
2011	29.813
2012	28.548
2013	27.336
2014	26.067
2015	27.09
2016	28.285
2017	29.585
2018	30.975
2019	30.512
2020	30.073
2021	30.032
2022	30.065
2023	30.053