Year	% of total working-age population with basic education
1997	30.921
1998	31.356
1999	30.868
2000	29.814
2001	30.145
2002	28.134
2003	30.477
2004	32.479
2005	29.602
2006	32.557
2007	32.588
2008	34.309
2009	33.694
2010	33.342
2011	36.867
2012	35.976
2013	36.661
2014	40.419
2015	40.699
2016	42.575
2017	44.757
2018	46.009
2019	42.294
2020	40.782
2021	34.305
2022	36.933
2023	37.735