| Value | Category | Cases | |
|---|---|---|---|
| 1 | GPS | 5 | 
                                                                 
                                    
                                    4.7%
                                 
                                                             | 
                                                        
                    
| 2 | land title | 37 | 
                                                                 
                                    
                                    34.6%
                                 
                                                             | 
                                                        
                    
| 3 | self-reported | 65 | 
                                                                 
                                    
                                    60.7%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 393 |