| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    2.1%
                                 | 
| 1 | Yes | 11 | 
                                    
                                    11.3%
                                 | 
| 2 | No | 84 | 
                                    
                                    86.6%
                                 |