| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                                                 
                                    
                                    22.2%
                                 
                                                             | 
                                                        
                    
| 850 | 1 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 1200 | 1 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 1740 | 1 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 1800 | 1 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 2100 | 1 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 2500 | 1 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 3000 | 1 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 6000 | 3 | 
                                                                 
                                    
                                    16.7%
                                 
                                                             | 
                                                        
                    |
| 8000 | 2 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 10000 | 1 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 12000 | 1 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 138 |