| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 3825 | 
                                                                 
                                    
                                    49.4%
                                 
                                                             | 
                                                        
                    
| 2001 | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 2002 | 300 | 
                                                                 
                                    
                                    3.9%
                                 
                                                             | 
                                                        
                    |
| 2003 | 871 | 
                                                                 
                                    
                                    11.3%
                                 
                                                             | 
                                                        
                    |
| 2004 | 733 | 
                                                                 
                                    
                                    9.5%
                                 
                                                             | 
                                                        
                    |
| 2005 | 860 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 2006 | 1028 | 
                                                                 
                                    
                                    13.3%
                                 
                                                             | 
                                                        
                    |
| 2007 | 57 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 4444 | Marked on card | 53 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    
| 6666 | Mother reported | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9997 | Inconsistent | 12 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| 9998 | DK | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9999 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1054 |