| قيمة | فئة | حالات | |
|---|---|---|---|
| 1 | قبل عام 1950 | 29 | 
                                                                 
                                    
                                    11.6%
                                 
                                                             | 
                                                        
                    
| 2 | (1950 -1959) | 49 | 
                                                                 
                                    
                                    19.7%
                                 
                                                             | 
                                                        
                    
| 3 | (1960 - 1969) | 69 | 
                                                                 
                                    
                                    27.7%
                                 
                                                             | 
                                                        
                    
| 4 | (1970 - 1979) | 102 | 
                                                                 
                                    
                                    41%
                                 
                                                             | 
                                                        
                    
| 5 | (1980 - 1989) | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 6 | (1990 - 1999) | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 7 | بعد 2000 | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             |