| Value | Category | Cases | |
|---|---|---|---|
| 1 | Limited duration | 415 | 
                                                                 
                                    
                                    14.8%
                                 
                                                             | 
                                                        
                    
| 2 | Permanent nature | 1893 | 
                                                                 
                                    
                                    67.6%
                                 
                                                             | 
                                                        
                    
| 3 | Unspecified duration | 494 | 
                                                                 
                                    
                                    17.6%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 7197 |