| Value | Category | Cases | |
|---|---|---|---|
| 1 | Self-produced | 232 | 
                                    
                                    73.4%
                                 | 
| 2 | Purchased | 84 | 
                                    
                                    26.6%
                                 | 
| 3 | Received for free | 0 | 
                                    
                                    0%
                                 | 
| Sysmiss | 43989 |