| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1996 | 122 | 
                                                                 
                                    
                                    33.4%
                                 
                                                             | 
                                                        
                    |
| 1997 | 121 | 
                                                                 
                                    
                                    33.2%
                                 
                                                             | 
                                                        
                    |
| 1998 | 86 | 
                                                                 
                                    
                                    23.6%
                                 
                                                             | 
                                                        
                    |
| 1999 | 24 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    |
| 2000 | 11 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 9997 | inconsistent | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9998 | dk | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 6390 |