| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 7103 | 
                                                                 
                                    
                                    91.8%
                                 
                                                             | 
                                                        
                    
| 2002 | 13 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 2003 | 31 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 2004 | 66 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 2005 | 115 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    |
| 2006 | 314 | 
                                                                 
                                    
                                    4.1%
                                 
                                                             | 
                                                        
                    |
| 2007 | 71 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 4444 | Marked on card | 14 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| 6666 | Mother reported | 10 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9997 | Inconsistent | 4 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9998 | DK | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9999 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1054 |