| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 2456 | 
                                                                 
                                    
                                    31.7%
                                 
                                                             | 
                                                        
                    
| 2001 | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 2002 | 436 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 2003 | 982 | 
                                                                 
                                    
                                    12.7%
                                 
                                                             | 
                                                        
                    |
| 2004 | 1149 | 
                                                                 
                                    
                                    14.8%
                                 
                                                             | 
                                                        
                    |
| 2005 | 1196 | 
                                                                 
                                    
                                    15.5%
                                 
                                                             | 
                                                        
                    |
| 2006 | 1161 | 
                                                                 
                                    
                                    15%
                                 
                                                             | 
                                                        
                    |
| 2007 | 304 | 
                                                                 
                                    
                                    3.9%
                                 
                                                             | 
                                                        
                    |
| 4444 | Marked on card | 47 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 6666 | Mother reported | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9997 | Inconsistent | 8 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9998 | DK | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9999 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1054 |