| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 82 | 
                                                                 
                                    
                                    24.7%
                                 
                                                             | 
                                                        
                    |
| 1997 | 116 | 
                                                                 
                                    
                                    34.9%
                                 
                                                             | 
                                                        
                    |
| 1998 | 83 | 
                                                                 
                                    
                                    25%
                                 
                                                             | 
                                                        
                    |
| 1999 | 38 | 
                                                                 
                                    
                                    11.4%
                                 
                                                             | 
                                                        
                    |
| 2000 | 13 | 
                                                                 
                                    
                                    3.9%
                                 
                                                             | 
                                                        
                    |
| 9997 | inconsistent | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9998 | dk | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 6423 |