| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2406 | 
                                                                 
                                    
                                    49.5%
                                 
                                                             | 
                                                        
                    
| 0 | 1568 | 
                                                                 
                                    
                                    32.3%
                                 
                                                             | 
                                                        
                    |
| 1 | 673 | 
                                                                 
                                    
                                    13.9%
                                 
                                                             | 
                                                        
                    |
| 2 | 146 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 3 | 36 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 4 | 15 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 5 | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 6 | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 7 | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 8 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 12 | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 19 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 23 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 100 | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 5815 |