| Value | Category | Cases | |
|---|---|---|---|
| 1981 | 1981 | 1003 | 
                                    
                                    100%
                                 | 
| 1982 | 1982 | 0 | 
                                    
                                    0%
                                 | 
| 1984 | 1984 | 0 | 
                                    
                                    0%
                                 | 
| -4 | Not asked | 0 |