| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
28.6%
|
| 2008 | 2 |
14.3%
|
|
| 2010 | 2 |
14.3%
|
|
| 2018 | 1 |
7.1%
|
|
| 2019 | 1 |
7.1%
|
|
| 2020 | 2 |
14.3%
|
|
| 2022 | 1 |
7.1%
|
|
| 2023 | 1 |
7.1%
|
|
| Sysmiss | 416 |