| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
8.7%
|
| 1994 | 2 |
8.7%
|
|
| 2007 | 2 |
8.7%
|
|
| 2010 | 2 |
8.7%
|
|
| 2013 | 1 |
4.3%
|
|
| 2014 | 2 |
8.7%
|
|
| 2016 | 1 |
4.3%
|
|
| 2018 | 2 |
8.7%
|
|
| 2019 | 3 |
13%
|
|
| 2020 | 3 |
13%
|
|
| 2021 | 2 |
8.7%
|
|
| 2022 | 1 |
4.3%
|
|
| Sysmiss | 341 |