In the first and second qtr. of 2008 the number of young people under 15 years with non-stated education is higher than in the rest of the period. That is because the student register until 2007 only covers 8th grade of primary school. From 2007 it also covers the rest of primary school, but the information about highest completed education first appears from 2nd qtr. of 2008 and on. In the first qtr. of 2008 this group therefore appears with non-stated educational level.