| Value | Category | Cases | |
|---|---|---|---|
| 1 | Limited duration | 8194 | 
                                                                 
                                    
                                    13.8%
                                 
                                                             | 
                                                        
                    
| 2 | Permanent nature | 35473 | 
                                                                 
                                    
                                    59.8%
                                 
                                                             | 
                                                        
                    
| 3 | Unspecified duration | 15685 | 
                                                                 
                                    
                                    26.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 211006 |