| Value | Category | Cases | |
|---|---|---|---|
| 1 | Primary or none | 1282 | 
                                    
                                    8.2%
                                 | 
| 2 | Secondary | 1539 | 
                                    
                                    9.8%
                                 | 
| 3 | Higher | 1145 | 
                                    
                                    7.3%
                                 | 
| Sysmiss | 11669 | 
                                    
                                    74.6%
                                 |