| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 4 | 
                                    
                                    0%
                                 | 
| 0 | Never | 11836 | 
                                    
                                    46.6%
                                 | 
| 1 | Just once or twice | 8111 | 
                                    
                                    31.9%
                                 | 
| 2 | Many times | 4312 | 
                                    
                                    17%
                                 | 
| 3 | Always | 1001 | 
                                    
                                    3.9%
                                 | 
| 9 | Don't Know | 133 | 
                                    
                                    0.5%
                                 | 
| 998 | Refused | 0 | 
                                    
                                    0%
                                 |