| Value | Category | Cases | |
|---|---|---|---|
| 77 | Refuse to answer | 0 | 
                                    
                                    0%
                                 | 
| 99 | Do not know | 0 | 
                                    
                                    0%
                                 | 
| 200 | 21 | 
                                    
                                    100%
                                 | |
| Sysmiss | 6199 |