| Value | Category | Cases | |
|---|---|---|---|
| -2 | don't know | 0 | 
                                    
                                    0%
                                 | 
| -1 | refuse | 4 | 
                                    
                                    16%
                                 | 
| 0 | 5 | 
                                    
                                    20%
                                 | |
| 1 | 90-1500 | 6 | 
                                    
                                    24%
                                 | 
| 2 | 15001-15000 | 10 | 
                                    
                                    40%
                                 | 
| Sysmiss | 1024 |