| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
12.5%
|
| 1 | Airport | 2 |
25%
|
| 2 | Land border crossing | 0 |
0%
|
| 3 | Seaport | 5 |
62.5%
|
| Sysmiss | 149 |