| Value | Category | Cases | |
|---|---|---|---|
| 1 | For a specified period | 4 |
80%
|
| 2 | Permanent or until retire | 0 |
0%
|
| 3 | Not permanent but without a specified end date | 1 |
20%
|
| 4 | For the completion of tasks | 0 |
0%
|
| Sysmiss | 4539 |