| Value | Category | Cases | |
|---|---|---|---|
| 1 | A written contract | 9105 | 
                                                                 
                                    
                                    51.8%
                                 
                                                             | 
                                                        
                    
| 2 | A verbal agreement | 8416 | 
                                                                 
                                    
                                    47.9%
                                 
                                                             | 
                                                        
                    
| 8 | dk | 40 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 12582 |