| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 | 
                                    
                                    1.3%
                                 | |
| 1996 | 1 | 
                                    
                                    1.3%
                                 | |
| 1997 | 2 | 
                                    
                                    2.7%
                                 | |
| 1998 | 9 | 
                                    
                                    12%
                                 | |
| 1999 | 9 | 
                                    
                                    12%
                                 | |
| 2000 | 26 | 
                                    
                                    34.7%
                                 | |
| 2001 | 11 | 
                                    
                                    14.7%
                                 | |
| 2002 | 11 | 
                                    
                                    14.7%
                                 | |
| 2003 | 5 | 
                                    
                                    6.7%
                                 | |
| Sysmiss | 2080 |