| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.4%
|
| 1 | Airport | 37 |
25.5%
|
| 2 | Land border crossing | 1 |
0.7%
|
| 3 | Seaport | 105 |
72.4%
|
| Sysmiss | 774 |