| Value | Category | Cases | |
|---|---|---|---|
| 0 | 11 | 
                                    
                                    0.8%
                                 | |
| 1 | 438 | 
                                    
                                    31%
                                 | |
| 2 | 607 | 
                                    
                                    43%
                                 | |
| 3 | 232 | 
                                    
                                    16.4%
                                 | |
| 4 | 78 | 
                                    
                                    5.5%
                                 | |
| 5 | 33 | 
                                    
                                    2.3%
                                 | |
| 6 | 9 | 
                                    
                                    0.6%
                                 | |
| 7 | 5 | 
                                    
                                    0.4%
                                 | |
| Missing value | 14 |