| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 7 | 
                            
                             
                                
                                12.3%
                                                             
                            
                         | 
                        
                    |
| 2008 | 19 | 
                            
                             
                                
                                33.3%
                                                             
                            
                         | 
                        
                    |
| 2009 | 16 | 
                            
                             
                                
                                28.1%
                                                             
                            
                         | 
                        
                    |
| 2010 | 15 | 
                            
                             
                                
                                26.3%
                                                             
                            
                         | 
                        
                    |
| 8888 | D/K Year | 0 | 
                            
                             
                                
                                0%
                                                             
                            
                         | 
                        
                    
| 9999 | N/A | 0 | 
                            
                             
                                
                                0%
                                                             
                            
                         | 
                        
                    
| Sysmiss | 1940 |