| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 |
6.5%
|
| 1 | Airport | 7 |
3.8%
|
| 2 | Land border crossing | 102 |
54.8%
|
| 3 | Seaport or waterway | 65 |
34.9%
|
| Sysmiss | 414 |