| Value | Category | 
                                    
                    
                        | -99 | Don't Know | 
                                    
                    
                        | -98 | Not applicable | 
                                    
                    
                        | -97 | Refused | 
                                    
                    
                        | -96 | Other (specify) | 
                                    
                    
                        | 1 | In-House | 
                                    
                    
                        | 2 | On Plot, In Yard | 
                                    
                    
                        | Sysmiss |  | 
                            
            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.