| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 8 |
4.4%
|
| 2 | Land border crossing | 25 |
13.7%
|
| 3 | Seaport or waterway | 149 |
81.9%
|
| Sysmiss | 463 |