| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 2601325 | 
                                                                 
                                    
                                    96.4%
                                 
                                                             | 
                                                        
                    
| 2 | Yes, some difficulty | 72363 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    
| 3 | Yes, a lot of difficulty | 21596 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    
| 4 | Cannot do at all | 3514 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 384774 |