| 2008 |  |  |  |  |  |  |  |  |  | 
 | Both boys and girls |  |  |  |  |  |  |  |  |  | 
 | All pupils | 25.6 | 48.8 | 25.6 | 24.5 | 48.9 | 26.5 | 26.8 | 48.8 | 24.4 | 
 | Parents do not have tertiary education | 32.4 | 48.2 | 19.4 | 32.8 | 49.7 | 17.5 | 35.3 | 48.6 | 16.1 | 
 | Parents have tertiary education | 18.3 | 49.8 | 32.0 | 15.0 | 48.6 | 36.4 | 17.2 | 49.4 | 33.4 | 
 | Parents' educational attainment level is unknown | 33.7 | 42.1 | 24.2 | 46.2 | 40.4 | 13.4 | 43.8 | 40.6 | 15.7 | 
 | Boys |  |  |  |  |  |  |  |  |  | 
 | All pupils | 26.3 | 47.5 | 26.1 | 27.6 | 47.5 | 24.8 | 24.2 | 45.6 | 30.2 | 
 | Parents do not have tertiary education | 33.5 | 46.6 | 19.9 | 36.9 | 47.4 | 15.7 | 32.8 | 46.8 | 20.4 | 
 | Parents have tertiary education | 18.8 | 48.7 | 32.5 | 17.4 | 48.1 | 34.5 | 14.9 | 44.5 | 40.5 | 
 | Parents' educational attainment level is unknown | 33.6 | 43.1 | 23.3 | 48.2 | 39.3 | 12.4 | 38.1 | 41.7 | 20.3 | 
 | Girls |  |  |  |  |  |  |  |  |  | 
 | All pupils | 24.9 | 50.1 | 25.0 | 21.4 | 50.4 | 28.2 | 29.4 | 52.0 | 18.5 | 
 | Parents do not have tertiary education | 31.2 | 49.8 | 19.0 | 28.7 | 52.1 | 19.2 | 37.8 | 50.3 | 11.8 | 
 | Parents have tertiary education | 17.8 | 50.8 | 31.4 | 12.6 | 49.1 | 38.3 | 19.6 | 54.5 | 25.9 | 
 | Parents' educational attainment level is unknown | 33.7 | 41.1 | 25.2 | 44.2 | 41.4 | 14.4 | 49.4 | 39.5 | 11.1 | 
 |  |  |  |  |  |  |  |  |  |  | 
 | 2007 |  |  |  |  |  |  |  |  |  | 
 | Both boys and girls |  |  |  |  |  |  |  |  |  | 
 | All pupils | 27.5 | 47.5 | 25.0 | 26.5 | 50.1 | 23.4 | 26.6 | 47.2 | 26.2 | 
 | Parents do not have tertiary education | 33.7 | 47.1 | 19.1 | 34.5 | 50.4 | 15.1 | 34.7 | 47.6 | 17.7 | 
 | Parents have tertiary education | 20.1 | 48.3 | 31.5 | 16.8 | 50.2 | 33.0 | 16.6 | 47.4 | 36.0 | 
 | Parents' educational attainment level is unknown | 36.2 | 41.0 | 22.8 | 45.2 | 42.3 | 12.5 | 43.8 | 38.1 | 18.1 | 
 | Boys |  |  |  |  |  |  |  |  |  | 
 | All pupils | 28.3 | 45.6 | 26.0 | 30.5 | 48.5 | 21.0 | 26.0 | 45.2 | 28.8 | 
 | Parents do not have tertiary education | 34.9 | 45.1 | 20.0 | 39.7 | 47.2 | 13.1 | 34.3 | 46.2 | 19.5 | 
 | Parents have tertiary education | 20.8 | 46.4 | 32.8 | 19.7 | 50.4 | 30.0 | 16.1 | 44.4 | 39.5 | 
 | Parents' educational attainment level is unknown | 36.3 | 41.9 | 21.9 | 47.6 | 40.2 | 12.2 | 41.5 | 40.1 | 18.3 | 
 | Girls |  |  |  |  |  |  |  |  |  | 
 | All pupils | 26.6 | 49.5 | 23.9 | 22.4 | 51.7 | 25.8 | 27.2 | 49.3 | 23.5 | 
 | Parents do not have tertiary education | 32.6 | 49.2 | 18.2 | 29.2 | 53.6 | 17.2 | 35.3 | 48.9 | 15.8 | 
 | Parents have tertiary education | 19.5 | 50.3 | 30.2 | 13.8 | 50.1 | 36.1 | 17.2 | 50.6 | 32.3 | 
 | Parents' educational attainment level is unknown | 36.2 | 40.1 | 23.8 | 42.8 | 44.4 | 12.7 | 46.2 | 35.9 | 17.9 | 
 |  |