Year	% (modeled ILO estimate)
1991	18.456
1992	18.669
1993	18.791
1994	18.978
1995	19.133
1996	19.412
1997	19.664
1998	19.755
1999	19.808
2000	19.903
2001	20.016
2002	19.961
2003	19.84
2004	19.808
2005	20.071
2006	20.746
2007	20.825
2008	20.857
2009	20.196
2010	20.185
2011	18.109
2012	19.229
2013	19.706
2014	20.276
2015	20.293
2016	20.387
2017	20.525
2018	20.477
2019	19.797
2020	18.447
2021	18.775
2022	19.42
2023	19.801