| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 | 
                                    
                                    5.6%
                                 | |
| 2001 | 7 | 
                                    
                                    38.9%
                                 | |
| 2002 | 10 | 
                                    
                                    55.6%
                                 | |
| Sysmiss | 434 |