| Value | Category | Cases | |
|---|---|---|---|
| 1982 | 4 | 
                                                                 
                                    
                                    14.8%
                                 
                                                             | 
                                                        
                    |
| 1983 | 7 | 
                                                                 
                                    
                                    25.9%
                                 
                                                             | 
                                                        
                    |
| 1984 | 3 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 1985 | 3 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 1986 | 3 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 1987 | 4 | 
                                                                 
                                    
                                    14.8%
                                 
                                                             | 
                                                        
                    |
| 1988 | 3 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 72 |