| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    
| 0 | 4 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    |
| 1 | 5 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 2 | 18 | 
                                                                 
                                    
                                    12.6%
                                 
                                                             | 
                                                        
                    |
| 3 | 26 | 
                                                                 
                                    
                                    18.2%
                                 
                                                             | 
                                                        
                    |
| 4 | 15 | 
                                                                 
                                    
                                    10.5%
                                 
                                                             | 
                                                        
                    |
| 5 | 25 | 
                                                                 
                                    
                                    17.5%
                                 
                                                             | 
                                                        
                    |
| 6 | 5 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 7 | 8 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 8 | 6 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    |
| 9 | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 10 | 17 | 
                                                                 
                                    
                                    11.9%
                                 
                                                             | 
                                                        
                    |
| 11 | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 12 | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 15 | 2 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 20 | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 24 | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 30 | 2 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 36 | 2 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 66 |