| Value | Category | 
                                    
                    
                        | -9 | -9. Don't know | 
                                    
                    
                        | -5 | -5. Refused | 
                                    
                    
                        | -3 | -3. Not applicable | 
                                    
                    
                        | -1 | -1. Missing | 
                                    
                    
                        | 1 | 1. Never | 
                                    
                    
                        | 2 | 2. Only under certain circumstances | 
                                    
                    
                        | 3 | 3. Always | 
                            
            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.