| Value | Category | Cases | |
|---|---|---|---|
| 1 | Basic level | 4457 |
18.4%
|
| 2 | Intermediate level | 13343 |
55.2%
|
| 3 | Advanced level | 3629 |
15%
|
| 4 | Skill not needed | 2763 |
11.4%
|
| Sysmiss | 27559 |