| Value | Category | 
                                    
                    
                        | -9 | Don't know (spontaneous) | 
                                    
                    
                        | -8 | Refusal (spontaneous) | 
                                    
                    
                        | 0 | No payments or gifts are paid | 
                                    
                    
                        | 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.