| Value | Category | Cases | |
|---|---|---|---|
| 0 | with great difficulty | 102 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    
| 1 | 13 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 2 | 48 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 3 | 108 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                                                        
                    |
| 4 | 201 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    |
| 5 | 711 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 6 | 454 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    |
| 7 | 929 | 
                                                                 
                                    
                                    14.5%
                                 
                                                             | 
                                                        
                    |
| 8 | 1562 | 
                                                                 
                                    
                                    24.4%
                                 
                                                             | 
                                                        
                    |
| 9 | 695 | 
                                                                 
                                    
                                    10.9%
                                 
                                                             | 
                                                        
                    |
| 10 | very easily | 1426 | 
                                                                 
                                    
                                    22.3%
                                 
                                                             | 
                                                        
                    
| -8 | other error | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -7 | filter error | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -3 | inapplicable | 140 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    
| -2 | no answer | 5 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| -1 | does not know | 8 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             |