| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    8%
                                 | 
| 1 | Airport | 0 | 
                                    
                                    0%
                                 | 
| 2 | Land border crossing | 17 | 
                                    
                                    68%
                                 | 
| 3 | Seaport or waterway | 6 | 
                                    
                                    24%
                                 | 
| Sysmiss | 338 |