| Value | Category |
|---|---|
| 1 | Costs too much |
| 2 | Must travel too far |
| 3 | Did not know it should be registered |
| 4 | Late, and did not want to pay fine |
| 5 | Does not know where to register |
| 6 | Lack of time/Registration postponed |
| 7 | Missing other documents |
| 96 | Other |
| 98 | DK |
| 99 | Missing |