| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 535 | 
                                                                 
                                    
                                    6.9%
                                 
                                                             | 
                                                        
                    
| 2001 | 693 | 
                                                                 
                                    
                                    9%
                                 
                                                             | 
                                                        
                    |
| 2002 | 1102 | 
                                                                 
                                    
                                    14.2%
                                 
                                                             | 
                                                        
                    |
| 2003 | 1216 | 
                                                                 
                                    
                                    15.7%
                                 
                                                             | 
                                                        
                    |
| 2004 | 1251 | 
                                                                 
                                    
                                    16.2%
                                 
                                                             | 
                                                        
                    |
| 2005 | 1369 | 
                                                                 
                                    
                                    17.7%
                                 
                                                             | 
                                                        
                    |
| 2006 | 1264 | 
                                                                 
                                    
                                    16.3%
                                 
                                                             | 
                                                        
                    |
| 2007 | 281 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 4444 | Marked on card | 22 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 6666 | Mother reported | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9997 | Inconsistent | 8 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9998 | DK | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9999 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1054 |