| Value | Category | Cases | |
|---|---|---|---|
| 1 | Most important | 148418 | 
                                    
                                    47.9%
                                 | 
| 2 | relating to known | 99437 | 
                                    
                                    32.1%
                                 | 
| 3 | by heart | 62092 | 
                                    
                                    20%
                                 | 
| 7 | N/A | 165248 | |
| 8 | Invalid | 3188 | |
| 9 | Missing | 7107 |