Year	% of official school-age population
1997	57.44874
1998	57.25759
1999	55.09517
2000	55.8749
2001	57.61858
2002	56.68088
2003	55.82174
2004	55.07766
2005	53.93119
2006	52.79074
2007	51.67599
2008	51.19786
2009	50.83499
2010	51.30795
2011	51.25317
2012	51.03085
2013	50.86534
2014	50.81938
2015	51.29353
2016	50.88325
2017	50.68115
2018	50.24298