| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.4%
|
| 1990 | 6 |
4.2%
|
|
| 1992 | 1 |
0.7%
|
|
| 1996 | 2 |
1.4%
|
|
| 1997 | 1 |
0.7%
|
|
| 1998 | 1 |
0.7%
|
|
| 1999 | 1 |
0.7%
|
|
| 2005 | 1 |
0.7%
|
|
| 2010 | 2 |
1.4%
|
|
| 2014 | 1 |
0.7%
|
|
| 2018 | 3 |
2.1%
|
|
| 2019 | 3 |
2.1%
|
|
| 2020 | 18 |
12.7%
|
|
| 2021 | 15 |
10.6%
|
|
| 2022 | 27 |
19%
|
|
| 2023 | 35 |
24.6%
|
|
| 2024 | 23 |
16.2%
|
|
| Sysmiss | 222 |