| Value | Category | Cases | |
|---|---|---|---|
| N1 | 8 | 
                                    
                                    8.7%
                                 | |
| N2 | 42 | 
                                    
                                    45.7%
                                 | |
| N3 | 21 | 
                                    
                                    22.8%
                                 | |
| N4 | 13 | 
                                    
                                    14.1%
                                 | |
| N5 | 4 | 
                                    
                                    4.3%
                                 | |
| N6 | 3 | 
                                    
                                    3.3%
                                 | |
| N7 | 1 | 
                                    
                                    1.1%
                                 |