| Value | Category | Cases | |
|---|---|---|---|
| 1993 | 4 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1994 | 444 | 
                                                                 
                                    
                                    13.7%
                                 
                                                             | 
                                                        
                    |
| 1995 | 765 | 
                                                                 
                                    
                                    23.7%
                                 
                                                             | 
                                                        
                    |
| 1996 | 731 | 
                                                                 
                                    
                                    22.6%
                                 
                                                             | 
                                                        
                    |
| 1997 | 526 | 
                                                                 
                                    
                                    16.3%
                                 
                                                             | 
                                                        
                    |
| 1998 | 330 | 
                                                                 
                                    
                                    10.2%
                                 
                                                             | 
                                                        
                    |
| 1999 | 325 | 
                                                                 
                                    
                                    10.1%
                                 
                                                             | 
                                                        
                    |
| 2000 | 107 | 
                                                                 
                                    
                                    3.3%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 9004 |