Year	% (modeled ILO estimate)
1991	25.528
1992	25.403
1993	23.013
1994	21.601
1995	20.808
1996	19.07
1997	18.797
1998	17.321
1999	17.815
2000	18.187
2001	18.232
2002	18.453
2003	18.662
2004	18.853
2005	19.214
2006	19.405
2007	19.704
2008	19.76
2009	19.568
2010	19.875
2011	20.257
2012	20.429
2013	20.829
2014	21.204
2015	21.659
2016	22.16
2017	22.154
2018	22.003
2019	21.888
2020	21.136
2021	20.729
2022	20.679
2023	20.819