| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 6 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    |
| 1995 | 2 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 1996 | 4 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 1997 | 14 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    |
| 1998 | 45 | 
                                                                 
                                    
                                    21.1%
                                 
                                                             | 
                                                        
                    |
| 1999 | 83 | 
                                                                 
                                    
                                    39%
                                 
                                                             | 
                                                        
                    |
| 2000 | 59 | 
                                                                 
                                    
                                    27.7%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 12023 |