Year	% of official school-age population
1997	50.70214
1998	50.59858
1999	51.25647
2000	53.55668
2001	53.5725
2002	53.50969
2003	54.17262
2004	54.50442
2005	55.16401
2006	56.08934
2007	56.38627
2008	56.51231
2009	56.58121
2010	58.06897
2011	57.69133
2012	56.58048
2013	56.93817
2014	56.45334
2015	56.83233
2016	56.70902
2017	56.98646
2018	56.91336