| Value | Category | Cases | |
|---|---|---|---|
| Home made | 6 | 
                                    
                                    66.7%
                                 | |
| Home made briquettes | 1 | 
                                    
                                    11.1%
                                 | |
| Made in different resources by themselves | 1 | 
                                    
                                    11.1%
                                 | |
| Own made | 1 | 
                                    
                                    11.1%
                                 |