| Value | Category | Cases | |
|---|---|---|---|
| 1 | Collected | 3659 | 
                                                                 
                                    
                                    93.6%
                                 
                                                             | 
                                                        
                    
| 2 | Purchased | 245 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    
| 3 | Aid agency | 2 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 4 | Other(specify) | 4 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 270 |