Year	% (modeled ILO estimate)
1991	60.091
1992	60.405
1993	59.983
1994	59.567
1995	58.831
1996	58.254
1997	59.011
1998	58.471
1999	57.596
2000	57.047
2001	56.309
2002	55.881
2003	52.689
2004	49.478
2005	46.272
2006	43.097
2007	39.984
2008	36.951
2009	38.986
2010	39.271
2011	51.703
2012	44.133
2013	35.564
2014	37.132
2015	39.228
2016	36.743
2017	37.707
2018	43.358
2019	43.034
2020	39.919
2021	40.967
2022	40.464
2023	40.009