| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 7 |
7.1%
|
| 2 | Land border crossing | 10 |
10.2%
|
| 3 | Seaport | 81 |
82.7%
|
| Sysmiss | 551 |