| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 2508 | 
                                                                 
                                    
                                    32.4%
                                 
                                                             | 
                                                        
                    
| 2001 | 3 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 2002 | 433 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 2003 | 969 | 
                                                                 
                                    
                                    12.5%
                                 
                                                             | 
                                                        
                    |
| 2004 | 1133 | 
                                                                 
                                    
                                    14.6%
                                 
                                                             | 
                                                        
                    |
| 2005 | 1196 | 
                                                                 
                                    
                                    15.5%
                                 
                                                             | 
                                                        
                    |
| 2006 | 1152 | 
                                                                 
                                    
                                    14.9%
                                 
                                                             | 
                                                        
                    |
| 2007 | 293 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    |
| 4444 | Marked on card | 46 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 6666 | Mother reported | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9997 | Inconsistent | 8 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9998 | DK | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9999 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1054 |