| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 8 | 
                                    
                                    0%
                                 | 
| 0 | Never | 10896 | 
                                    
                                    42.9%
                                 | 
| 1 | Just once or twice | 3972 | 
                                    
                                    15.6%
                                 | 
| 2 | Several times | 5236 | 
                                    
                                    20.6%
                                 | 
| 3 | Many times | 3503 | 
                                    
                                    13.8%
                                 | 
| 4 | Always | 1659 | 
                                    
                                    6.5%
                                 | 
| 9 | Don't Know | 123 | 
                                    
                                    0.5%
                                 | 
| 998 | Refused | 0 | 
                                    
                                    0%
                                 |