| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.6%
|
| 1 | Airport | 15 |
9.3%
|
| 2 | Land border crossing | 80 |
49.7%
|
| 3 | Seaport | 65 |
40.4%
|
| Sysmiss | 437 |