| Value | Category | Cases | |
|---|---|---|---|
| N1 | 4 | 
                                    
                                    12.9%
                                 | |
| N2 | 12 | 
                                    
                                    38.7%
                                 | |
| N3 | 12 | 
                                    
                                    38.7%
                                 | |
| N4 | 2 | 
                                    
                                    6.5%
                                 | |
| N5 | 1 | 
                                    
                                    3.2%
                                 |