| Value | Category | 
                                    
                    
                        | 1 | small scale | 
                                    
                    
                        | 2 | medium scale | 
                                    
                    
                        | 3 | large scale | 
                                    
                    
                        | 4 | non agric | 
                                    
                    
                        | 5 | low cost | 
                                    
                    
                        | 6 | medium coct | 
                                    
                    
                        | 7 | high cost | 
                            
            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.