| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1993 | 6 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1994 | 7 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 1995 | 6 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1996 | 10 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 1997 | 22 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    |
| 1998 | 41 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| 1999 | 34 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 2000 | 34 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 2001 | 53 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| 2002 | 71 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| 2003 | 84 | 
                                                                 
                                    
                                    5.9%
                                 
                                                             | 
                                                        
                    |
| 2004 | 90 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    |
| 2005 | 118 | 
                                                                 
                                    
                                    8.3%
                                 
                                                             | 
                                                        
                    |
| 2006 | 144 | 
                                                                 
                                    
                                    10.1%
                                 
                                                             | 
                                                        
                    |
| 2007 | 115 | 
                                                                 
                                    
                                    8%
                                 
                                                             | 
                                                        
                    |
| 2008 | 54 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    |
| 3333 | Missing | 154 | 
                                                                 
                                    
                                    10.8%
                                 
                                                             | 
                                                        
                    
| 5555 | Not Applicable | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 7777 | Never Moved | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 8888 | Refused | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9999 | Don't know | 385 | 
                                                                 
                                    
                                    26.9%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 8174 |