| Value | Category |
|---|---|
| -1 | missing |
| 1 | you were registered to vote |
| 2 | you did not want to register |
| 3 | you could not find a place to register |
| 4 | you were prevented from registering |
| 5 | you were too young to register |
| 6 | did not register for some other reason |
| 9 | don't know/can't remember |
| 998 | refused |