| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 2717 | 
                                                                 
                                    
                                    35.1%
                                 
                                                             | 
                                                        
                    
| 2001 | 181 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 2002 | 337 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    |
| 2003 | 668 | 
                                                                 
                                    
                                    8.6%
                                 
                                                             | 
                                                        
                    |
| 2004 | 1003 | 
                                                                 
                                    
                                    13%
                                 
                                                             | 
                                                        
                    |
| 2005 | 1277 | 
                                                                 
                                    
                                    16.5%
                                 
                                                             | 
                                                        
                    |
| 2006 | 1251 | 
                                                                 
                                    
                                    16.2%
                                 
                                                             | 
                                                        
                    |
| 2007 | 276 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 4444 | Marked on card | 23 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 6666 | Mother reported | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9997 | Inconsistent | 8 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9998 | DK | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9999 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1054 |