| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 8 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 2001 | 1106 | 
                                                                 
                                    
                                    14.3%
                                 
                                                             | 
                                                        
                    |
| 2002 | 1169 | 
                                                                 
                                    
                                    15.1%
                                 
                                                             | 
                                                        
                    |
| 2003 | 1215 | 
                                                                 
                                    
                                    15.7%
                                 
                                                             | 
                                                        
                    |
| 2004 | 1350 | 
                                                                 
                                    
                                    17.4%
                                 
                                                             | 
                                                        
                    |
| 2005 | 1334 | 
                                                                 
                                    
                                    17.2%
                                 
                                                             | 
                                                        
                    |
| 2006 | 1245 | 
                                                                 
                                    
                                    16.1%
                                 
                                                             | 
                                                        
                    |
| 2007 | 292 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    |
| 4444 | Marked on card | 15 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| 6666 | Mother reported | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9997 | Inconsistent | 7 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9998 | DK | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9999 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1054 |