| Value | Category |
|---|---|
| -99 | Refuse to answer |
| -98 | Difficult to answer/Don't remember |
| -97 | Don't know/No information |
| -9 | Interrupted interview |
| -7 | Legal Skip |
| -3 | Interviewer error |
| 1 | From people in RA |
| 2 | From people in abroad |
| 3 | Both from people in RA and in abroad |
| 4 | From the institution in RA |
| 5 | From the institution in abroad |