| Value | Category | Cases | |
|---|---|---|---|
| 1 | explicitly requested | 5 | 
                                                                 
                                    
                                    31.3%
                                 
                                                             | 
                                                        
                    
| 2 | voluntary | 11 | 
                                                                 
                                    
                                    68.8%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 7957 |