| Value | Category | Cases | |
|---|---|---|---|
| 1 | Basic level | 3946 |
16.3%
|
| 2 | Intermediate level | 12118 |
50.1%
|
| 3 | Advanced level | 4575 |
18.9%
|
| 4 | Skill not needed | 3553 |
14.7%
|
| Sysmiss | 27559 |