Duration of pre-primary is the number of grades (years) in pre-primary education.
| Date | Valeur | Modifier , % |
|---|---|---|
| 2019 | 3,0 | 0,00 % |
| 2018 | 3,0 | 0,00 % |
| 2016 | 3,0 | 0,00 % |
| 2015 | 3,0 | 0,00 % |
| 2014 | 3,0 | 0,00 % |
| 2013 | 3,0 | 0,00 % |
| 2012 | 3,0 | 0,00 % |
| 2011 | 3,0 | 0,00 % |
| 2010 | 3,0 | 0,00 % |
| 2009 | 3,0 | 0,00 % |
| 2008 | 3,0 | 0,00 % |
| 2007 | 3,0 |