Year	% of official school-age population
1997	50.73572
1998	50.60319
1999	51.44262
2000	53.69433
2001	53.71589
2002	53.61627
2003	54.34024
2004	54.60064
2005	55.2652
2006	56.35899
2007	56.66237
2008	56.88302
2009	56.75623
2010	58.31343
2011	57.91711
2012	56.91895
2013	57.25096
2014	56.84035
2015	57.14175
2016	57.0368
2017	57.31232
2018	57.23213