| Value | Category | Cases | |
|---|---|---|---|
| N1 | 19 | 
                                    
                                    17%
                                 | |
| N2 | 63 | 
                                    
                                    56.3%
                                 | |
| N3 | 22 | 
                                    
                                    19.6%
                                 | |
| N4 | 8 | 
                                    
                                    7.1%
                                 |