| Value | Category | Cases | |
|---|---|---|---|
| N1 | 156 | 
                                    
                                    37.6%
                                 | |
| N2 | 123 | 
                                    
                                    29.6%
                                 | |
| N3 | 92 | 
                                    
                                    22.2%
                                 | |
| N4 | 27 | 
                                    
                                    6.5%
                                 | |
| N5 | 9 | 
                                    
                                    2.2%
                                 | |
| N6 | 4 | 
                                    
                                    1%
                                 | |
| N7 | 1 | 
                                    
                                    0.2%
                                 | |
| N8 | 2 | 
                                    
                                    0.5%
                                 | |
| N9 | 1 | 
                                    
                                    0.2%
                                 |