| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 5 |
6.9%
|
| 2 | Land border crossing | 11 |
15.3%
|
| 3 | Seaport or waterway | 56 |
77.8%
|
| Sysmiss | 292 |