| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 22 |
19.1%
|
| 2 | Land border crossing | 82 |
71.3%
|
| 3 | Seaport or waterway | 11 |
9.6%
|
| Sysmiss | 260 |