| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.9%
|
| 1 | Airport | 6 |
5.6%
|
| 2 | Land border crossing | 9 |
8.4%
|
| 3 | Seaport | 90 |
84.1%
|
| Sysmiss | 1193 |