| Value | Category | Cases | |
|---|---|---|---|
| 1 | Self-produced | 1050 | 
                                    
                                    8.8%
                                 | 
| 2 | Purchased | 10782 | 
                                    
                                    90.8%
                                 | 
| 3 | Received for free | 45 | 
                                    
                                    0.4%
                                 | 
| Sysmiss | 32428 |