| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.2%
|
| 1 | Airport | 10 |
12%
|
| 2 | Land border crossing | 4 |
4.8%
|
| 3 | Seaport | 68 |
81.9%
|
| Sysmiss | 517 |