| 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 |