| Value | Category | Cases | |
|---|---|---|---|
| 1985 | 1 | 
                                    
                                    0%
                                 | |
| 1988 | 1 | 
                                    
                                    0%
                                 | |
| 1989 | 1 | 
                                    
                                    0%
                                 | |
| 1991 | 1 | 
                                    
                                    0%
                                 | |
| 1993 | 1 | 
                                    
                                    0%
                                 | |
| 1996 | 1 | 
                                    
                                    0%
                                 | |
| 1997 | 1 | 
                                    
                                    0%
                                 | |
| 1999 | 2 | 
                                    
                                    0.1%
                                 | |
| 2000 | 1 | 
                                    
                                    0%
                                 | |
| 2002 | 1 | 
                                    
                                    0%
                                 | |
| 6666 | Filter | 2027 | 
                                    
                                    99.4%
                                 | 
| 7777 | Verweigert | 0 | 
                                    
                                    0%
                                 | 
| 8888 | Weiss nicht | 0 | 
                                    
                                    0%
                                 | 
| 9999 | Keine Angabe | 2 | 
                                    
                                    0.1%
                                 |