| Value | 
                    Category | 
                                                                            
                                    
                    
                        | 2002 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 2008 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 2009 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 2010 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 2011 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 2012 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 2147483625 | 
                        Don't know  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 2147483634 | 
                        Missing  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 2147483636 | 
                        Other  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 2147483639 | 
                        Refused  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 10001 | 
                        .M  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 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.