| Value | Category | Cases | |
|---|---|---|---|
| N1 | 32 | 
                                    
                                    24.4%
                                 | |
| N2 | 87 | 
                                    
                                    66.4%
                                 | |
| N3 | 9 | 
                                    
                                    6.9%
                                 | |
| N4 | 3 | 
                                    
                                    2.3%
                                 |