| Value | Category | 
                                    
                    
                        | 1 | Money | 
                                    
                    
                        | 2 | Job security | 
                                    
                    
                        | 3 | Health | 
                                    
                    
                        | 4 | Safety | 
                                    
                    
                        | 5 | Don?t know | 
                                    
                    
                        | 6 | Other | 
                                    
                    
                        | 7 | Refuse to ansewr | 
                                    
                    
                        | 99 |  | 
                            
            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.