Year	% of official school-age population
1997	56.47393
1998	56.3322
1999	55.05925
2000	54.33394
2001	56.13693
2002	55.77894
2003	55.44668
2004	55.17939
2005	53.95445
2006	52.79596
2007	51.64691
2008	51.1069
2009	50.90001
2010	51.73656
2011	52.01152
2012	51.69911
2013	51.48393
2014	51.34797
2015	52.02962
2016	51.70867
2017	51.52072
2018	50.99692