| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 15 |
9.3%
|
| 2 | Land border crossing | 107 |
66.5%
|
| 3 | Seaport or waterway | 39 |
24.2%
|
| Sysmiss | 431 |