| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 2 | 
                                                                 
                                    
                                    13.3%
                                 
                                                             | 
                                                        
                    |
| 2006 | 1 | 
                                                                 
                                    
                                    6.7%
                                 
                                                             | 
                                                        
                    |
| 2009 | 1 | 
                                                                 
                                    
                                    6.7%
                                 
                                                             | 
                                                        
                    |
| 2011 | 2 | 
                                                                 
                                    
                                    13.3%
                                 
                                                             | 
                                                        
                    |
| 2012 | 2 | 
                                                                 
                                    
                                    13.3%
                                 
                                                             | 
                                                        
                    |
| 2013 | 1 | 
                                                                 
                                    
                                    6.7%
                                 
                                                             | 
                                                        
                    |
| 2014 | 3 | 
                                                                 
                                    
                                    20%
                                 
                                                             | 
                                                        
                    |
| 2015 | 3 | 
                                                                 
                                    
                                    20%
                                 
                                                             | 
                                                        
                    |
| 9997 | inconsistent | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9998 | don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 6466 |