| Value | Category | Cases | |
|---|---|---|---|
| 98 | 2 | 
                                    
                                    0.5%
                                 | |
| 99 | 1 | 
                                    
                                    0.3%
                                 | |
| 2000 | 1 | 
                                    
                                    0.3%
                                 | |
| 2001 | 2 | 
                                    
                                    0.5%
                                 | |
| 2002 | 116 | 
                                    
                                    29.4%
                                 | |
| 2003 | 211 | 
                                    
                                    53.6%
                                 | |
| 2004 | 61 | 
                                    
                                    15.5%
                                 | |
| Sysmiss | 1 |