| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.3%
|
| 1 | Airport | 1 |
0.7%
|
| 2 | Land border crossing | 142 |
94.7%
|
| 3 | Seaport or waterway | 5 |
3.3%
|
| Sysmiss | 352 |