| Value | Category | Cases | |
|---|---|---|---|
| N1 | 2 | 
                                    
                                    2.2%
                                 | |
| N2 | 38 | 
                                    
                                    42.7%
                                 | |
| N3 | 25 | 
                                    
                                    28.1%
                                 | |
| N4 | 14 | 
                                    
                                    15.7%
                                 | |
| N5 | 9 | 
                                    
                                    10.1%
                                 | |
| N6 | 1 | 
                                    
                                    1.1%
                                 |