| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1%
|
| 1 | Airport | 5 |
2.5%
|
| 2 | Land border crossing | 168 |
83.6%
|
| 3 | Seaport or waterway | 26 |
12.9%
|
| Sysmiss | 201 |