| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
8.3%
|
| 1 | Airport | 2 |
8.3%
|
| 2 | Land border crossing | 9 |
37.5%
|
| 3 | Seaport or waterway | 11 |
45.8%
|
| Sysmiss | 126 |