| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 2 |
5.6%
|
| 2 | Land border crossing | 2 |
5.6%
|
| 3 | Seaport or waterway | 32 |
88.9%
|
| Sysmiss | 109 |