| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
3.5%
|
| 1 | Airport | 5 |
8.8%
|
| 2 | Land border crossing | 3 |
5.3%
|
| 3 | Seaport | 47 |
82.5%
|
| Sysmiss | 2898 |