| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
21.1%
|
| 2001 | 1 |
5.3%
|
|
| 2002 | 1 |
5.3%
|
|
| 2003 | 1 |
5.3%
|
|
| 2006 | 1 |
5.3%
|
|
| 2007 | 1 |
5.3%
|
|
| 2009 | 1 |
5.3%
|
|
| 2010 | 1 |
5.3%
|
|
| 2011 | 1 |
5.3%
|
|
| 2014 | 2 |
10.5%
|
|
| 2018 | 1 |
5.3%
|
|
| 2019 | 1 |
5.3%
|
|
| 2020 | 1 |
5.3%
|
|
| 2021 | 1 |
5.3%
|
|
| 2022 | 1 |
5.3%
|
|
| Sysmiss | 154 |