| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.8%
|
| 1 | Airport | 8 |
6.8%
|
| 2 | Land border crossing | 97 |
82.2%
|
| 3 | Seaport or waterway | 12 |
10.2%
|
| Sysmiss | 193 |