| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 5386 | 
                                                                 
                                    
                                    69.6%
                                 
                                                             | 
                                                        
                    
| 2002 | 4 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 2003 | 232 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 2004 | 667 | 
                                                                 
                                    
                                    8.6%
                                 
                                                             | 
                                                        
                    |
| 2005 | 730 | 
                                                                 
                                    
                                    9.4%
                                 
                                                             | 
                                                        
                    |
| 2006 | 620 | 
                                                                 
                                    
                                    8%
                                 
                                                             | 
                                                        
                    |
| 2007 | 45 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 4444 | Marked on card | 45 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 6666 | Mother reported | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9997 | Inconsistent | 12 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| 9998 | DK | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9999 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1054 |