| Value | Category | Cases | |
|---|---|---|---|
| N1 | 18 | 
                                    
                                    64.3%
                                 | |
| N2 | 9 | 
                                    
                                    32.1%
                                 | |
| N3 | 1 | 
                                    
                                    3.6%
                                 |