| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
2.6%
|
| 1 | Airport | 19 |
16.7%
|
| 2 | Land border crossing | 0 |
0%
|
| 3 | Seaport | 92 |
80.7%
|
| Sysmiss | 888 |