| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 2 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1996 | 4 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 1997 | 5 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1998 | 3 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 1999 | 16 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 2000 | 17 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 2001 | 31 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    |
| 2002 | 37 | 
                                                                 
                                    
                                    7.9%
                                 
                                                             | 
                                                        
                    |
| 2003 | 67 | 
                                                                 
                                    
                                    14.3%
                                 
                                                             | 
                                                        
                    |
| 2004 | 84 | 
                                                                 
                                    
                                    17.9%
                                 
                                                             | 
                                                        
                    |
| 2005 | 123 | 
                                                                 
                                    
                                    26.3%
                                 
                                                             | 
                                                        
                    |
| 2006 | 77 | 
                                                                 
                                    
                                    16.5%
                                 
                                                             | 
                                                        
                    |
| 2007 | 2 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 454 |