| Value | Category | Cases | |
|---|---|---|---|
| 1 | Self-produced | 6201 | 
                                    
                                    44.9%
                                 | 
| 2 | Purchased | 7568 | 
                                    
                                    54.8%
                                 | 
| 3 | Received for free | 29 | 
                                    
                                    0.2%
                                 | 
| Sysmiss | 30507 |