| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 | 
                                                         
                                
                                1.1%
                                                             
                                                     | 
                                            |
| 2000 | 2 | 
                                                         
                                
                                2.2%
                                                             
                                                     | 
                                            |
| 2002 | 1 | 
                                                         
                                
                                1.1%
                                                             
                                                     | 
                                            |
| 2003 | 1 | 
                                                         
                                
                                1.1%
                                                             
                                                     | 
                                            |
| 2004 | 1 | 
                                                         
                                
                                1.1%
                                                             
                                                     | 
                                            |
| 2006 | 4 | 
                                                         
                                
                                4.3%
                                                             
                                                     | 
                                            |
| 2007 | 7 | 
                                                         
                                
                                7.5%
                                                             
                                                     | 
                                            |
| 2008 | 22 | 
                                                         
                                
                                23.7%
                                                             
                                                     | 
                                            |
| 2009 | 54 | 
                                                         
                                
                                58.1%
                                                             
                                                     | 
                                            |
| 9997 | Inconsistent | 0 | 
                                                         
                                
                                0%
                                                             
                                                     | 
                                            
| 9998 | Don't know | 0 | 
                                                         
                                
                                0%
                                                             
                                                     | 
                                            
| Sysmiss | 6023 |