| Value | Category | 
                                    
                    
                        | -9 | No answer | 
                                    
                    
                        | -7 | Not sure | 
                                    
                    
                        | 0 |  | 
                                    
                    
                        | 1 | Yes | 
                                    
                    
                        | 2 | No | 
                                    
                    
                        | 7 |  | 
                                    
                    
                        | 25 |  | 
                                    
                    
                        | 28 |  | 
                                    
                    
                        | 48 |  | 
                                    
                    
                        | 50 |  | 
                                    
                    
                        | 82 |  | 
                                    
                    
                        | 90 |  | 
                                    
                    
                        | 125 |  | 
                                    
                    
                        | 150 |  | 
                                    
                    
                        | 153 |  | 
                                    
                    
                        | 200 |  | 
                                    
                    
                        | 216 |  | 
                                    
                    
                        | 220 |  | 
                                    
                    
                        | 240 |  | 
                                    
                    
                        | 249 |  | 
                                    
                    
                        | 300 |  | 
                                    
                    
                        | 310 |  | 
                                    
                    
                        | 450 |  | 
                                    
                    
                        | 480 |  | 
                                    
                    
                        | 600 |  | 
                            
            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.