| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 14 | 
                                                                 
                                    
                                    2%
                                 
                                                             | 
                                                        
                    |
| 1997 | 94 | 
                                                                 
                                    
                                    13.5%
                                 
                                                             | 
                                                        
                    |
| 1998 | 102 | 
                                                                 
                                    
                                    14.6%
                                 
                                                             | 
                                                        
                    |
| 1999 | 108 | 
                                                                 
                                    
                                    15.5%
                                 
                                                             | 
                                                        
                    |
| 2000 | 144 | 
                                                                 
                                    
                                    20.6%
                                 
                                                             | 
                                                        
                    |
| 2001 | 109 | 
                                                                 
                                    
                                    15.6%
                                 
                                                             | 
                                                        
                    |
| 2002 | 125 | 
                                                                 
                                    
                                    17.9%
                                 
                                                             | 
                                                        
                    |
| 2003 | 2 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 301 |