| Value | Category | Cases | |
|---|---|---|---|
| 1 | Upper | 1421 |
9.6%
|
| 2 | Middle | 5309 |
35.8%
|
| 3 | Skilled | 4641 |
31.3%
|
| 4 | Unskill | 3438 |
23.2%
|
| -5 | Missing; Unknown; Inappropiate | 0 | |
| -4 | Not asked | 9532 | |
| -3 | Not applicable | 0 | |
| -2 | No answer | 27 | |
| -1 | Don't know | 190 |