| Value | Category | Cases | |
|---|---|---|---|
| 1 | Self-produced | 3257 | 
                                    
                                    11.6%
                                 | 
| 2 | Purchased | 24814 | 
                                    
                                    88.2%
                                 | 
| 3 | Received for free | 66 | 
                                    
                                    0.2%
                                 | 
| Sysmiss | 16168 |