| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 7 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 1996 | 124 | 
                                                                 
                                    
                                    37.8%
                                 
                                                             | 
                                                        
                    |
| 1997 | 105 | 
                                                                 
                                    
                                    32%
                                 
                                                             | 
                                                        
                    |
| 1998 | 65 | 
                                                                 
                                    
                                    19.8%
                                 
                                                             | 
                                                        
                    |
| 1999 | 17 | 
                                                                 
                                    
                                    5.2%
                                 
                                                             | 
                                                        
                    |
| 2000 | 10 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 9997 | inconsistent | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9998 | dk | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 6427 |