| Value | Category | Cases | |
|---|---|---|---|
| 1 | Plutôt difficile | 310 | 
                                    
                                    20.6%
                                 | 
| 2 | Plutôt facile | 924 | 
                                    
                                    61.3%
                                 | 
| 3 | nsp | 231 | 
                                    
                                    15.3%
                                 | 
| 9 | nr | 42 | 
                                    
                                    2.8%
                                 |