| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 |
0.5%
|
| -8 | Refusal (Spontaneous) | 0 |
0%
|
| 1 | Yes | 0 |
0%
|
| 2 | No | 1719 |
99.5%
|