| Value | Category |
|---|---|
| 0 | Unspecified |
| 1 | Managers |
| 2 | High Professionals |
| 3 | Technicians and middle level professionals |
| 4 | Clerk |
| 5 | Service workers and sales men |
| 6 | Experienced agricultural workers |
| 7 | Craft workers |
| 8 | Machine operators |
| 9 | Unqualified workers |
| 9999 | Not Stated |
| Sysmiss |