| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 81 | 
                                                                 
                                    
                                    13.5%
                                 
                                                             | 
                                                        
                    |
| 1998 | 133 | 
                                                                 
                                    
                                    22.2%
                                 
                                                             | 
                                                        
                    |
| 1999 | 129 | 
                                                                 
                                    
                                    21.5%
                                 
                                                             | 
                                                        
                    |
| 2000 | 111 | 
                                                                 
                                    
                                    18.5%
                                 
                                                             | 
                                                        
                    |
| 2001 | 111 | 
                                                                 
                                    
                                    18.5%
                                 
                                                             | 
                                                        
                    |
| 2002 | 34 | 
                                                                 
                                    
                                    5.7%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 7374 |