| Value | Category | Cases | |
|---|---|---|---|
| 1 | Self-produced | 11163 | 
                                    
                                    50.8%
                                 | 
| 2 | Purchased | 10770 | 
                                    
                                    49%
                                 | 
| 3 | Received for free | 33 | 
                                    
                                    0.2%
                                 | 
| Sysmiss | 22339 |