| Value | Category | Cases | |
|---|---|---|---|
| 22 | 2 | 
                                    
                                    0.3%
                                 | |
| N1 | 184 | 
                                    
                                    31.1%
                                 | |
| N2 | 288 | 
                                    
                                    48.6%
                                 | |
| N3 | 86 | 
                                    
                                    14.5%
                                 | |
| N4 | 16 | 
                                    
                                    2.7%
                                 | |
| N5 | 7 | 
                                    
                                    1.2%
                                 | |
| N6 | 2 | 
                                    
                                    0.3%
                                 | |
| N9 | 7 | 
                                    
                                    1.2%
                                 |