| Value | Category | 
                                    
                    
                        | 1 | Cow milk | 
                                    
                    
                        | 2 | Goat milk | 
                                    
                    
                        | 3 | Camel milk | 
                                    
                    
                        | 4 | Eggs | 
                                    
                    
                        | 5 | Butter | 
                                    
                    
                        | 6 | Cheese | 
                                    
                    
                        | 7 | Honey | 
                                    
                    
                        | 8 | Wool | 
                                    
                    
                        | 9 | Hide & Skins | 
                                    
                    
                        | 10 | Manure | 
                                    
                    
                        | 11 | Dung | 
                                    
                    
                        | 99 | Missing | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.