| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 5 |
16.7%
|
| 2 | Land border crossing | 6 |
20%
|
| 3 | Seaport or waterway | 19 |
63.3%
|
| Sysmiss | 315 |