| Value | Category | 
                                    
                    
                        | -9 | Don't know | 
                                    
                    
                        | 0 | Micro <5 | 
                                    
                    
                        | 1 | Small >=5 and <=19 | 
                                    
                    
                        | 2 | Medium >=20 and <=99 | 
                                    
                    
                        | 3 | Large >=100 | 
                            
            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.