| Value | Category | Cases | |
|---|---|---|---|
| N1 | 126 | 
                                    
                                    44.1%
                                 | |
| N2 | 105 | 
                                    
                                    36.7%
                                 | |
| N3 | 29 | 
                                    
                                    10.1%
                                 | |
| N4 | 21 | 
                                    
                                    7.3%
                                 | |
| N5 | 3 | 
                                    
                                    1%
                                 | |
| N6 | 2 | 
                                    
                                    0.7%
                                 |