| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 1 |
20%
|
|
| 2010 | 1 |
20%
|
|
| 2011 | 1 |
20%
|
|
| 2015 | 1 |
20%
|
|
| 2023 | 1 |
20%
|
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 42007 |