| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 2 | 
                                
                                0%
                             | |
| 1999 | 1 | 
                                
                                0%
                             | |
| 2001 | 1 | 
                                
                                0%
                             | |
| 2003 | 1 | 
                                
                                0%
                             | |
| 2004 | 1 | 
                                
                                0%
                             | |
| 2005 | 6 | 
                                
                                0.1%
                             | |
| 2006 | 9 | 
                                
                                0.2%
                             | |
| 2007 | 4 | 
                                
                                0.1%
                             | |
| 9995 | Missing | 0 | 
                                
                                0%
                             | 
| 9999 | N/A | 5264 | 
                                
                                99.5%
                             |