| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 5 | 
                                    
                                    0%
                                 | 
| 0 | Never | 13133 | 
                                    
                                    51.7%
                                 | 
| 1 | Just once or twice | 3063 | 
                                    
                                    12.1%
                                 | 
| 2 | Several times | 3948 | 
                                    
                                    15.5%
                                 | 
| 3 | Many times | 3020 | 
                                    
                                    11.9%
                                 | 
| 4 | Always | 2183 | 
                                    
                                    8.6%
                                 | 
| 9 | Don't Know | 45 | 
                                    
                                    0.2%
                                 | 
| 998 | Refused | 0 | 
                                    
                                    0%
                                 |