| Value | Category | Cases | |
|---|---|---|---|
| 1 | Good knowledge | 612 | 
                                    
                                    9%
                                 | 
| 2 | Basic knowledge | 2014 | 
                                    
                                    29.5%
                                 | 
| 3 | I have no idea | 4178 | 
                                    
                                    61.2%
                                 | 
| Sysmiss | 19 |