| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.5%
|
| 1 | Airport | 3 |
1.6%
|
| 2 | Land border crossing | 161 |
85.2%
|
| 3 | Seaport or waterway | 24 |
12.7%
|
| Sysmiss | 313 |