| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| -9 | 7 | 28699 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                            
                        
                        
                            
                    |
| 1 | before 1952 | 69 | 190775 | 
                                                                 
                                    
                                    4.5%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 2 | 1952- 1959 | 81 | 216714 | 
                                                                 
                                    
                                    5.1%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 3 | 1960-1969 | 158 | 400492 | 
                                                                 
                                    
                                    9.4%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 4 | 1970-1979 | 265 | 730660 | 
                                                                 
                                    
                                    17.2%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 5 | 1980-1989 | 457 | 1161818 | 
                                                                 
                                    
                                    27.3%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 6 | 1990-1998 | 571 | 1506805 | 
                                                                 
                                    
                                    35.4%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 7 | do not know | 6 | 23904 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             |