| Value | Category | 
|---|---|
| -777 | |
| -666 | |
| 1 | Teaching in another public school | 
| 2 | Teaching in another private school | 
| 3 | Providing private tuitions | 
| 4 | Agriculture and livestock | 
| 5 | Business | 
| 6 | Politics and/or trade union work | 
| 7 | Social work | 
| 8 | Other income earning activities | 
| 77 | Not applicable |