| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
2%
|
| 1 | Airport | 21 |
20.8%
|
| 2 | Land border crossing | 16 |
15.8%
|
| 3 | Seaport | 62 |
61.4%
|
| Sysmiss | 256 |