| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 554 | 
                                                                 
                                    
                                    9.5%
                                 
                                                             | 
                                                        
                    
| 0 | 122 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 1 | 317 | 
                                                                 
                                    
                                    5.4%
                                 
                                                             | 
                                                        
                    |
| 2 | 1308 | 
                                                                 
                                    
                                    22.4%
                                 
                                                             | 
                                                        
                    |
| 3 | 1441 | 
                                                                 
                                    
                                    24.7%
                                 
                                                             | 
                                                        
                    |
| 4 | 1065 | 
                                                                 
                                    
                                    18.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 643 | 
                                                                 
                                    
                                    11%
                                 
                                                             | 
                                                        
                    |
| 6 | 263 | 
                                                                 
                                    
                                    4.5%
                                 
                                                             | 
                                                        
                    |
| 7 | 56 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 8 | 44 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 9 | 11 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 10 | 12 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 11 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 12 | 4 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 14 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 20 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 4829 |