| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
2%
|
| 1 | Airport | 4 |
7.8%
|
| 2 | Land border crossing | 13 |
25.5%
|
| 3 | Seaport | 33 |
64.7%
|
| Sysmiss | 111 |