| Value | Category |
|---|---|
| -99 | refused to answer |
| -88 | not provided |
| -77 | not applicable |
| -66 | do not know |
| -44 | Skip |
| 1 | not aware of any requirement to register |
| 2 | not sure how or where to register |
| 3 | don't have the time to register |
| 4 | to avoid dealing with corrupt officials |
| 5 | to avoid wasting time dealing with regulations |
| 6 | to avoid taxes |
| 7 | other |
| Sysmiss |