| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                    
                                    0.7%
                                 | 
| 0 | 3 | 
                                    
                                    0.5%
                                 | |
| 1 | 104 | 
                                    
                                    17%
                                 | |
| 2 | 168 | 
                                    
                                    27.5%
                                 | |
| 3 | 138 | 
                                    
                                    22.5%
                                 | |
| 4 | 147 | 
                                    
                                    24%
                                 | |
| 5 | 17 | 
                                    
                                    2.8%
                                 | |
| 6 | 14 | 
                                    
                                    2.3%
                                 | |
| 7 | 5 | 
                                    
                                    0.8%
                                 | |
| 8 | 3 | 
                                    
                                    0.5%
                                 | |
| 9 | 3 | 
                                    
                                    0.5%
                                 | |
| 10 | 1 | 
                                    
                                    0.2%
                                 | |
| 11 | 1 | 
                                    
                                    0.2%
                                 | |
| 12 | 2 | 
                                    
                                    0.3%
                                 | |
| 21 | 1 | 
                                    
                                    0.2%
                                 | |
| 37 | 1 | 
                                    
                                    0.2%
                                 |