| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
1.5%
|
| 1 | Airport | 24 |
11.8%
|
| 2 | Land border crossing | 90 |
44.1%
|
| 3 | Seaport or waterway | 87 |
42.6%
|
| Sysmiss | 1012 |