| Value | Category | Cases | |
|---|---|---|---|
| 1 | Basic level | 1400 |
5.8%
|
| 2 | Intermediate level | 9698 |
40.1%
|
| 3 | Advanced level | 12536 |
51.8%
|
| 4 | Skill not needed | 558 |
2.3%
|
| Sysmiss | 27559 |