| Value | Category | Cases | |
|---|---|---|---|
| 1 | Basic level | 6376 |
26.4%
|
| 2 | Intermediate level | 13138 |
54.3%
|
| 3 | Advanced level | 2511 |
10.4%
|
| 4 | Skill not needed | 2167 |
9%
|
| Sysmiss | 27559 |