| Value | Category |
|---|---|
| -9 | Don't know |
| -8 | Refused to answer |
| -7 | Not applicable |
| -6 | Still in process |
| -5 | Application denied |
| -4 | Skipped |
| -3 | Not provided |
| 1 | Are taken directly from establishments’ records |
| 2 | Are estimates computed with some precision |
| 3 | Are arbitrary and unreliable numbers |