Year	% (modeled ILO estimate)
1991	49.411
1992	49.18
1993	46.18
1994	45.22
1995	43.87
1996	43.42
1997	40.12
1998	38.64
1999	37.68
2000	40.19
2001	42.86
2002	41.43
2003	40.36
2004	38.99
2005	39.47
2006	37.54
2007	36.54
2008	36.52
2009	38.06
2010	39.29
2011	38.7
2012	38.53
2013	38.39
2014	38.76
2015	38.39
2016	39.79
2017	39.69
2018	39.22
2019	39.18
2020	36.06
2021	35.71
2022	35.6
2023	36.524