| Value | Category |
|---|---|
| 1 | Agriculture |
| 2 | Manufacturing |
| 3 | Construction |
| 4 | Mining, quarrying, electircity, gas, water supply |
| 5 | Market services |
| 6 | Non-market services |
| 7 | Not stated |
| a | Don't know |
| b | Refused to answer |
| c | Outlier set to missing |
| d | Dropped during anonymization (available on request) |
| e | Skipped in error |
| z | Not applicable |