Year	% (modeled ILO estimate)
1991	35.73
1992	35.537
1993	34.803
1994	34.728
1995	35.313
1996	36.536
1997	36.686
1998	36.287
1999	35.805
2000	35.511
2001	35.502
2002	35.81
2003	35.717
2004	35.816
2005	35.753
2006	36.082
2007	36.207
2008	36.097
2009	35.749
2010	35.405
2011	35.415
2012	35.935
2013	36.2
2014	36.491
2015	36.527
2016	36.573
2017	36.696
2018	36.889
2019	37.179
2020	36.509
2021	38.189
2022	38.259
2023	38.439