| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 2993 | 
                                                                 
                                    
                                    38.7%
                                 
                                                             | 
                                                        
                    
| 2001 | 134 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                                                        
                    |
| 2002 | 307 | 
                                                                 
                                    
                                    4%
                                 
                                                             | 
                                                        
                    |
| 2003 | 604 | 
                                                                 
                                    
                                    7.8%
                                 
                                                             | 
                                                        
                    |
| 2004 | 945 | 
                                                                 
                                    
                                    12.2%
                                 
                                                             | 
                                                        
                    |
| 2005 | 1231 | 
                                                                 
                                    
                                    15.9%
                                 
                                                             | 
                                                        
                    |
| 2006 | 1214 | 
                                                                 
                                    
                                    15.7%
                                 
                                                             | 
                                                        
                    |
| 2007 | 283 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| 4444 | Marked on card | 21 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 6666 | Mother reported | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9997 | Inconsistent | 9 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9998 | DK | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9999 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1054 |