| Value | Category | Cases | |
|---|---|---|---|
| N1 | 665 | 
                                    
                                    67.4%
                                 | |
| N2 | 213 | 
                                    
                                    21.6%
                                 | |
| N3 | 76 | 
                                    
                                    7.7%
                                 | |
| N4 | 29 | 
                                    
                                    2.9%
                                 | |
| N5 | 4 | 
                                    
                                    0.4%
                                 |