| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 5 |
14.7%
|
| 2 | Land border crossing | 0 |
0%
|
| 3 | Seaport or waterway | 29 |
85.3%
|
| Sysmiss | 327 |