Year	% (modeled ILO estimate)
1991	21.762
1992	21.641
1993	21.656
1994	21.458
1995	21.524
1996	21.655
1997	21.31
1998	20.997
1999	20.718
2000	20.486
2001	20.099
2002	19.742
2003	19.582
2004	19.486
2005	19.306
2006	18.995
2007	18.727
2008	19.228
2009	19.805
2010	20.258
2011	20.801
2012	21.451
2013	21.452
2014	21.46
2015	21.34
2016	21.085
2017	20.785
2018	20.442
2019	20.112
2020	17.888
2021	18.748
2022	19.083
2023	19.129