| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
2.5%
|
| 1 | Airport | 19 |
24.1%
|
| 2 | Land border crossing | 37 |
46.8%
|
| 3 | Seaport | 21 |
26.6%
|
| Sysmiss | 940 |