| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
17.6%
|
| 1957 | 1 |
5.9%
|
|
| 1984 | 1 |
5.9%
|
|
| 1987 | 1 |
5.9%
|
|
| 1992 | 1 |
5.9%
|
|
| 1995 | 1 |
5.9%
|
|
| 2000 | 1 |
5.9%
|
|
| 2001 | 1 |
5.9%
|
|
| 2010 | 1 |
5.9%
|
|
| 2011 | 1 |
5.9%
|
|
| 2012 | 1 |
5.9%
|
|
| 2018 | 1 |
5.9%
|
|
| 2021 | 1 |
5.9%
|
|
| 2023 | 2 |
11.8%
|
|
| Sysmiss | 139 |