| Value | Category | 
                                    
                    
                        | 1 | 1. 1 yr ago | 
                                    
                    
                        | 2 | 2. 2 yrs ago | 
                                    
                    
                        | 3 | 3. 3 yrs ago | 
                                    
                    
                        | 4 | 4. 4 yrs ago | 
                                    
                    
                        | 5 | 5. 5 yrs ago | 
                                    
                    
                        | 6 | 6. 6 yrs ago | 
                                    
                    
                        | 7 | 7. 7 yrs ago | 
                                    
                    
                        | 8 | 8. 8 yrs ago | 
                                    
                    
                        | 9 | 9. 9 yrs ago | 
                            
            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.