| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                    
                                    25%
                                 | 
| 0 | 2 | 
                                    
                                    12.5%
                                 | |
| 150 | 1 | 
                                    
                                    6.3%
                                 | |
| 700 | 1 | 
                                    
                                    6.3%
                                 | |
| 1000 | 2 | 
                                    
                                    12.5%
                                 | |
| 1800 | 1 | 
                                    
                                    6.3%
                                 | |
| 2000 | 1 | 
                                    
                                    6.3%
                                 | |
| 2700 | 1 | 
                                    
                                    6.3%
                                 | |
| 3000 | 1 | 
                                    
                                    6.3%
                                 | |
| 10000 | 1 | 
                                    
                                    6.3%
                                 | |
| 50000 | 1 | 
                                    
                                    6.3%
                                 | |
| Sysmiss | 134 |