| Value | Category | Cases | |
|---|---|---|---|
| 1 | Self-produced | 2217 | 
                                    
                                    52.1%
                                 | 
| 2 | Purchased | 2026 | 
                                    
                                    47.6%
                                 | 
| 3 | Received for free | 13 | 
                                    
                                    0.3%
                                 | 
| Sysmiss | 40049 |