| Value | Category | Cases | |
|---|---|---|---|
| 1 | GPS | 15 | 
                                                                 
                                    
                                    4.1%
                                 
                                                             | 
                                                        
                    
| 2 | land title | 115 | 
                                                                 
                                    
                                    31.7%
                                 
                                                             | 
                                                        
                    
| 3 | self-reported | 233 | 
                                                                 
                                    
                                    64.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 137 |