| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.7%
                                 | 
| 1 | Airport | 3 | 
                                    
                                    2.2%
                                 | 
| 2 | Land border crossing | 128 | 
                                    
                                    93.4%
                                 | 
| 3 | Seaport or waterway | 5 | 
                                    
                                    3.6%
                                 | 
| Sysmiss | 265 |