Year	% of total working-age population with basic education
1997	31.34
1998	29.88
1999	28.22
2000	27.407
2001	27.795
2002	26.01
2003	24.133
2004	23.745
2005	23.385
2006	22.672
2007	21.898
2008	21.308
2009	20.932
2010	20.705
2011	20.705
2012	20.576
2013	19.852
2014	19.363
2015	19.281
2016	18.188
2017	17.952
2018	17.53
2019	18.09
2020	18.065
2021	18.777
2022	18.437
2023	17.251