| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 1 | Airport | 15 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    
| 2 | Land border crossing | 107 | 
                                                                 
                                    
                                    66.5%
                                 
                                                             | 
                                                        
                    
| 3 | Seaport or waterway | 39 | 
                                                                 
                                    
                                    24.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 431 |