Year	% (modeled ILO estimate)
1991	33.79
1992	33.729
1993	33.611
1994	33.397
1995	33.094
1996	32.991
1997	32.795
1998	32.798
1999	32.51
2000	32.228
2001	32.097
2002	31.86
2003	31.596
2004	31.329
2005	31.07
2006	30.933
2007	30.768
2008	30.596
2009	30.441
2010	30.29
2011	30.218
2012	30.183
2013	30.097
2014	30.001
2015	29.896
2016	29.81
2017	29.704
2018	29.576
2019	29.394
2020	28.895
2021	28.82
2022	29.423
2023	29.398