Year	% (modeled ILO estimate)
1991	31.541
1992	31.082
1993	30.285
1994	29.513
1995	29.011
1996	28.29
1997	27.834
1998	27.496
1999	27.006
2000	26.26
2001	25.778
2002	25.078
2003	24.246
2004	23.408
2005	22.598
2006	21.346
2007	20.159
2008	19.037
2009	18.016
2010	17.123
2011	16.65
2012	16.276
2013	15.965
2014	15.653
2015	15.308
2016	15.11
2017	14.812
2018	14.467
2019	14.161
2020	13.568
2021	13.688
2022	14.141
2023	14.081