| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.8%
|
| 1 | Airport | 4 |
7.3%
|
| 2 | Land border crossing | 0 |
0%
|
| 3 | Seaport | 50 |
90.9%
|
| Sysmiss | 102 |