| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.4%
|
| 1 | Airport | 5 |
7%
|
| 2 | Land border crossing | 9 |
12.7%
|
| 3 | Seaport | 56 |
78.9%
|
| Sysmiss | 927 |