| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 | 
                                    
                                    5.4%
                                 | 
| 1 | Airport | 9 | 
                                    
                                    6.9%
                                 | 
| 2 | Land border crossing | 58 | 
                                    
                                    44.6%
                                 | 
| 3 | Seaport or waterway | 56 | 
                                    
                                    43.1%
                                 | 
| Sysmiss | 1286 |