| Value | Category | Cases | |
|---|---|---|---|
| 0 | 18 | 
                                                                 
                                    
                                    94.7%
                                 
                                                             | 
                                                        
                    |
| 4 | 1 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 17 |