| Value | Category | Cases | |
|---|---|---|---|
| N1 | 154 | 
                                    
                                    51.3%
                                 | |
| N2 | 109 | 
                                    
                                    36.3%
                                 | |
| N3 | 26 | 
                                    
                                    8.7%
                                 | |
| N4 | 9 | 
                                    
                                    3%
                                 | |
| N5 | 1 | 
                                    
                                    0.3%
                                 | |
| N6 | 1 | 
                                    
                                    0.3%
                                 |