| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.4%
|
| 1 | Airport | 82 |
30.9%
|
| 2 | Land border crossing | 97 |
36.6%
|
| 3 | Seaport or waterway | 85 |
32.1%
|
| Sysmiss | 2432 |