| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 12 |
30%
|
| 2 | Land border crossing | 21 |
52.5%
|
| 3 | Seaport | 7 |
17.5%
|
| Sysmiss | 1282 |