| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 9 |
14.1%
|
| 2 | Land border crossing | 47 |
73.4%
|
| 3 | Seaport or waterway | 8 |
12.5%
|
| Sysmiss | 93 |