| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 1 | Airport | 22 | 
                                                                 
                                    
                                    19.1%
                                 
                                                             | 
                                                        
                    
| 2 | Land border crossing | 82 | 
                                                                 
                                    
                                    71.3%
                                 
                                                             | 
                                                        
                    
| 3 | Seaport or waterway | 11 | 
                                                                 
                                    
                                    9.6%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 260 |