| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Airport | 10 |
7.5%
|
| 2 | Land border crossing | 88 |
66.2%
|
| 3 | Seaport or waterway | 35 |
26.3%
|
| Sysmiss | 1592 |