| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 2001 | 1 |
3.1%
|
|
| 2017 | 1 |
3.1%
|
|
| 2018 | 2 |
6.3%
|
|
| 2019 | 3 |
9.4%
|
|
| 2020 | 5 |
15.6%
|
|
| 2021 | 7 |
21.9%
|
|
| 2022 | 7 |
21.9%
|
|
| 2023 | 6 |
18.8%
|
|
| Sysmiss | 118 |