| Value | Category | Cases | |
|---|---|---|---|
| 1 | Self-produced | 6402 | 
                                    
                                    84.2%
                                 | 
| 2 | Purchased | 1179 | 
                                    
                                    15.5%
                                 | 
| 3 | Received for free | 26 | 
                                    
                                    0.3%
                                 | 
| Sysmiss | 36698 |