| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
2.6%
|
| 1 | Airport | 2 |
2.6%
|
| 2 | Land border crossing | 56 |
73.7%
|
| 3 | Seaport or waterway | 16 |
21.1%
|
| Sysmiss | 183 |