| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 42 | 
                                                                 
                                    
                                    15.4%
                                 
                                                             | 
                                                        
                    
| 0 | 34 | 
                                                                 
                                    
                                    12.5%
                                 
                                                             | 
                                                        
                    |
| 10 | 5 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 15 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 20 | 9 | 
                                                                 
                                    
                                    3.3%
                                 
                                                             | 
                                                        
                    |
| 30 | 5 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 40 | 2 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 50 | 23 | 
                                                                 
                                    
                                    8.5%
                                 
                                                             | 
                                                        
                    |
| 60 | 6 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    |
| 70 | 7 | 
                                                                 
                                    
                                    2.6%
                                 
                                                             | 
                                                        
                    |
| 75 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 80 | 5 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 85 | 2 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 90 | 2 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 95 | 4 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    |
| 97 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 99 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 100 | 122 | 
                                                                 
                                    
                                    44.9%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 309 |