| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 46 |
21.7%
|
| 2 | Land border crossing | 3 |
1.4%
|
| 3 | Seaport or waterway | 163 |
76.9%
|
| Sysmiss | 1306 |