| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 3 | 
                                    
                                    20%
                                 | |
| 2001 | 10 | 
                                    
                                    66.7%
                                 | |
| 2002 | 2 | 
                                    
                                    13.3%
                                 | |
| Sysmiss | 437 |