| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 5 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 1995 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 1996 | 5 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 1997 | 11 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 1998 | 49 | 
                                                                 
                                    
                                    23.4%
                                 
                                                             | 
                                                        
                    |
| 1999 | 80 | 
                                                                 
                                    
                                    38.3%
                                 
                                                             | 
                                                        
                    |
| 2000 | 58 | 
                                                                 
                                    
                                    27.8%
                                 
                                                             | 
                                                        
                    |
| 9997 | inconsistent | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9998 | dk | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 12027 |