| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, never | 414184 |
91.5%
|
| 2 | Yes, once | 32837 |
7.3%
|
| 3 | Yes, twice or more | 5554 |
1.2%
|
| 7 | N/A | 29757 | |
| 8 | Invalid | 452 | |
| 9 | Miss | 33174 |