| Value | Category | Cases | |
|---|---|---|---|
| 1993 | 3 | 
                                    
                                    27.3%
                                 | |
| 1994 | 4 | 
                                    
                                    36.4%
                                 | |
| 1996 | 2 | 
                                    
                                    18.2%
                                 | |
| 1997 | 1 | 
                                    
                                    9.1%
                                 | |
| 1998 | 1 | 
                                    
                                    9.1%
                                 | |
| Sysmiss | 19881 |