| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
12.3%
|
| 1 | Airport | 5 |
8.8%
|
| 2 | Land border crossing | 0 |
0%
|
| 3 | Seaport | 45 |
78.9%
|
| Sysmiss | 301 |