| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.6%
|
| 1 | Airport | 21 |
12.1%
|
| 2 | Land border crossing | 1 |
0.6%
|
| 3 | Seaport | 150 |
86.7%
|
| Sysmiss | 180 |