| Value | Category | Cases | |
|---|---|---|---|
| -9 | 31 | 
                                    
                                    16%
                                 | |
| 0 | 18 | 
                                    
                                    9.3%
                                 | |
| 1 | 18 | 
                                    
                                    9.3%
                                 | |
| 2 | 39 | 
                                    
                                    20.1%
                                 | |
| 3 | 35 | 
                                    
                                    18%
                                 | |
| 4 | 29 | 
                                    
                                    14.9%
                                 | |
| 5 | 22 | 
                                    
                                    11.3%
                                 | |
| 12 | 1 | 
                                    
                                    0.5%
                                 | |
| 20 | 1 | 
                                    
                                    0.5%
                                 | |
| Sysmiss | 21 |