| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 7 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 1995 | 22 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                                                        
                    |
| 1996 | 138 | 
                                                                 
                                    
                                    10.5%
                                 
                                                             | 
                                                        
                    |
| 1997 | 279 | 
                                                                 
                                    
                                    21.1%
                                 
                                                             | 
                                                        
                    |
| 1998 | 332 | 
                                                                 
                                    
                                    25.2%
                                 
                                                             | 
                                                        
                    |
| 1999 | 404 | 
                                                                 
                                    
                                    30.6%
                                 
                                                             | 
                                                        
                    |
| 2000 | 138 | 
                                                                 
                                    
                                    10.5%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 10916 |