| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, never | 398132 | 
                                    
                                    92.3%
                                 | 
| 2 | Yes, once | 28466 | 
                                    
                                    6.6%
                                 | 
| 3 | Yes, twice or more | 4680 | 
                                    
                                    1.1%
                                 | 
| 7 | N/A | 24533 | |
| 8 | Invalid | 569 | |
| 9 | Missing | 29110 |