| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.2%
|
| -8 | Refusal (Spontaneous) | 1 |
0.1%
|
| 1 | Yes | 114 |
6.6%
|
| 2 | No | 1609 |
93.2%
|