| Value | Category | 
                                    
                    
                        | 1 | Paid apprentices | 
                                    
                    
                        | 2 | Administrative, technical employees, clerical and office wor | 
                                    
                    
                        | 3 | Production workers | 
                                    
                    
                        | 4 | Total | 
                            
            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.