Year	% (modeled ILO estimate)
1991	36.2
1992	35.88
1993	35.937
1994	35.794
1995	35.682
1996	35.553
1997	34.57
1998	34.249
1999	34.194
2000	34.016
2001	34.288
2002	34.227
2003	34.206
2004	33.6
2005	33.523
2006	34.003
2007	34.14
2008	33.071
2009	32.02
2010	31.179
2011	30.35
2012	30.699
2013	31.05
2014	34.868
2015	38.89
2016	39.087
2017	39.284
2018	39.482
2019	39.68
2020	40.52
2021	40.62
2022	41.76
2023	42.405