Year	% (modeled ILO estimate)
1991	34.6
1992	34.687
1993	34.764
1994	34.843
1995	34.935
1996	35.031
1997	35.144
1998	35.287
1999	35.444
2000	35.605
2001	35.75
2002	35.862
2003	35.951
2004	36.006
2005	36.043
2006	36.076
2007	36.449
2008	36.828
2009	37.211
2010	37.598
2011	37.987
2012	38.368
2013	38.749
2014	39.123
2015	39.49
2016	39.859
2017	40.225
2018	40.593
2019	40.943
2020	36.013
2021	33.372