| Value | Category | Cases | |
|---|---|---|---|
| 1 | Free | 1 | 
                                    
                                    7.7%
                                 | 
| 2 | Partly free | 2 | 
                                    
                                    15.4%
                                 | 
| 3 | Not free | 10 | 
                                    
                                    76.9%
                                 | 
| Sysmiss | 6 |