| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 5053 | 
                                                                 
                                    
                                    65.3%
                                 
                                                             | 
                                                        
                    
| 2001 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 2002 | 9 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 2003 | 23 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 2004 | 702 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 2005 | 897 | 
                                                                 
                                    
                                    11.6%
                                 
                                                             | 
                                                        
                    |
| 2006 | 823 | 
                                                                 
                                    
                                    10.6%
                                 
                                                             | 
                                                        
                    |
| 2007 | 208 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 4444 | Marked on card | 19 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| 6666 | Mother reported | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9997 | Inconsistent | 6 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9998 | DK | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9999 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1054 |