| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
2.3%
|
| 1 | Airport | 16 |
12.4%
|
| 2 | Land border crossing | 29 |
22.5%
|
| 3 | Seaport | 81 |
62.8%
|
| Sysmiss | 858 |