| Value | Category | Cases | |
|---|---|---|---|
| 1 | GPS | 74 | 
                                                                 
                                    
                                    14.9%
                                 
                                                             | 
                                                        
                    
| 2 | land title | 164 | 
                                                                 
                                    
                                    32.9%
                                 
                                                             | 
                                                        
                    
| 3 | self-reported | 260 | 
                                                                 
                                    
                                    52.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 2 |