| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 |
13.5%
|
| 1 | Airport | 11 |
12.4%
|
| 2 | Land border crossing | 8 |
9%
|
| 3 | Seaport | 58 |
65.2%
|
| Sysmiss | 509 |