| Value | Category | Cases | |
|---|---|---|---|
| N1 | 2 | 
                                    
                                    3.1%
                                 | |
| N2 | 39 | 
                                    
                                    60.9%
                                 | |
| N3 | 18 | 
                                    
                                    28.1%
                                 | |
| N4 | 4 | 
                                    
                                    6.3%
                                 | |
| N7 | 1 | 
                                    
                                    1.6%
                                 |