| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, never | 142823 | 
                                    
                                    91.5%
                                 | 
| 2 | Yes, once | 9899 | 
                                    
                                    6.3%
                                 | 
| 3 | Yes, twice or more | 3286 | 
                                    
                                    2.1%
                                 | 
| 7 | N/A | 324947 | |
| 8 | Invalid | 197 | |
| 9 | Missing | 4338 |