| Value | Category | Cases | |
|---|---|---|---|
| 1 | only from P.D.S. | 8983 | 
                                                                 
                                    
                                    7.8%
                                 
                                                             | 
                                                        
                    
| 2 | only from other sources | 62161 | 
                                                                 
                                    
                                    54.2%
                                 
                                                             | 
                                                        
                    
| 3 | from both sources | 23523 | 
                                                                 
                                    
                                    20.5%
                                 
                                                             | 
                                                        
                    
| 4 | not purchased | 20084 | 
                                                                 
                                    
                                    17.5%
                                 
                                                             |