Year	% (modeled ILO estimate)
1991	21.307
1992	21.182
1993	19.478
1994	18.442
1995	17.825
1996	16.549
1997	16.361
1998	15.362
1999	15.633
2000	15.821
2001	15.773
2002	15.868
2003	15.834
2004	16.115
2005	16.417
2006	16.395
2007	16.637
2008	16.589
2009	16.466
2010	16.848
2011	17.274
2012	17.673
2013	18.021
2014	18.534
2015	18.934
2016	19.409
2017	19.297
2018	19.138
2019	19.099
2020	18.494
2021	18.197
2022	17.95
2023	18.088