| Value | Category | Cases | |
|---|---|---|---|
| 1 | Own preparation | 7153 | 
                                                                 
                                    
                                    73.6%
                                 
                                                             | 
                                                        
                    
| 2 | Bought | 2472 | 
                                                                 
                                    
                                    25.4%
                                 
                                                             | 
                                                        
                    
| 3 | Received for free | 100 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1517 |