| Value | Category | Cases | |
|---|---|---|---|
| 999 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 2000 | 2 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 2001 | 41 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    |
| 2002 | 244 | 
                                                                 
                                    
                                    7%
                                 
                                                             | 
                                                        
                    |
| 2003 | 449 | 
                                                                 
                                    
                                    12.9%
                                 
                                                             | 
                                                        
                    |
| 2004 | 667 | 
                                                                 
                                    
                                    19.2%
                                 
                                                             | 
                                                        
                    |
| 2005 | 1140 | 
                                                                 
                                    
                                    32.9%
                                 
                                                             | 
                                                        
                    |
| 2006 | 384 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 9998 | 4 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 9999 | Missing | 538 | 
                                                                 
                                    
                                    15.5%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 19042 |