Year	% of total working-age population with basic education
1987	50.998
1988	50.736
1989	50.141
1990	49.09
1991	46.251
1992	46.921
1993	45.231
1994	44.876
1995	44.024
1996	44.637
1997	43.255
1998	44.934
1999	44.133
2000	43.414
2001	42.664
2002	42.203
2003	41.683
2004	39.765
2005	39.763
2006	38.707
2007	38.381
2008	38.256
2009	38.828
2010	38.081
2011	36.256
2012	34.866
2013	33.944
2014	33.432
2015	34.268
2016	33.307
2017	32.253
2018	31.158
2019	28.76
2020	26.873
2021	27.993
2022	28.287
2023	27.928