| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing data | 3 | 
                                    
                                    0%
                                 | 
| 0 | Never | 12000 | 
                                    
                                    47.2%
                                 | 
| 1 | Once or twice | 1590 | 
                                    
                                    6.3%
                                 | 
| 2 | A few times | 1489 | 
                                    
                                    5.9%
                                 | 
| 3 | Often | 1341 | 
                                    
                                    5.3%
                                 | 
| 7 | No experience | 8117 | 
                                    
                                    32%
                                 | 
| 9 | Don't know | 857 | 
                                    
                                    3.4%
                                 | 
| 998 | Refused | 0 | 
                                    
                                    0%
                                 |