| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
5.4%
|
| 1 | Airport | 9 |
6.9%
|
| 2 | Land border crossing | 58 |
44.6%
|
| 3 | Seaport or waterway | 56 |
43.1%
|
| Sysmiss | 1286 |