| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.7%
|
| 1 | Airport | 3 |
2.2%
|
| 2 | Land border crossing | 128 |
93.4%
|
| 3 | Seaport or waterway | 5 |
3.6%
|
| Sysmiss | 265 |