| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 2015 | 35 | 
                                                                 
                                    
                                    2.6%
                                 
                                                             | 
                                                        
                    |
| 2016 | 609 | 
                                                                 
                                    
                                    45.4%
                                 
                                                             | 
                                                        
                    |
| 2017 | 441 | 
                                                                 
                                    
                                    32.9%
                                 
                                                             | 
                                                        
                    |
| 2018 | 254 | 
                                                                 
                                    
                                    19%
                                 
                                                             | 
                                                        
                    |
| 4444 | Marked on card | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 6666 | Mother reported | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9999 | No response | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 3314 |