| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 1 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 1997 | 1 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 1999 | 10 | 
                                                                 
                                    
                                    52.6%
                                 
                                                             | 
                                                        
                    |
| 2000 | 7 | 
                                                                 
                                    
                                    36.8%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 12217 |