| Value | Category | Cases | |
|---|---|---|---|
| 1 | never been | 3473 | 
                                                                 
                                    
                                    29.9%
                                 
                                                             | 
                                                        
                    
| 2 | have been to school in the past | 6948 | 
                                                                 
                                    
                                    59.8%
                                 
                                                             | 
                                                        
                    
| 3 | studying at present | 1196 | 
                                                                 
                                    
                                    10.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 4813 |