| Value | Category | Cases | |
|---|---|---|---|
| 1 | Basic level | 2325 |
9.6%
|
| 2 | Intermediate level | 2021 |
8.4%
|
| 3 | Advanced level | 1068 |
4.4%
|
| 4 | Skill not needed | 18778 |
77.6%
|
| Sysmiss | 27559 |