| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
8.7%
|
| 1 | Airport | 9 |
19.6%
|
| 2 | Land border crossing | 17 |
37%
|
| 3 | Seaport | 16 |
34.8%
|
| Sysmiss | 667 |