| Value | Category | Cases | |
|---|---|---|---|
| 1 | Written agreement with undetermined duration | 138642 | 
                                    
                                    37%
                                 | 
| 2 | Written agreement with fixed duration | 62049 | 
                                    
                                    16.5%
                                 | 
| 3 | Verbal agreement | 87528 | 
                                    
                                    23.3%
                                 | 
| 4 | No | 86848 | 
                                    
                                    23.2%
                                 | 
| Sysmiss | 2708505 |