| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 4 |
5.5%
|
| 2 | Land border crossing | 3 |
4.1%
|
| 3 | Seaport | 66 |
90.4%
|
| Sysmiss | 525 |