| Value | Category | Cases | |
|---|---|---|---|
| -2 | don/t know | 0 | 
                                    
                                    0%
                                 | 
| -1 | refuse | 0 | 
                                    
                                    0%
                                 | 
| 5000 | 1 | 
                                    
                                    50%
                                 | |
| 12000 | 1 | 
                                    
                                    50%
                                 | |
| Sysmiss | 1047 |