| Value | Category | Cases | |
|---|---|---|---|
| 99 | Don't Know | 0 | 
                                    
                                    0%
                                 | 
| 1999 | 8 | 
                                    
                                    13.3%
                                 | |
| 2000 | 9 | 
                                    
                                    15%
                                 | |
| 2001 | 14 | 
                                    
                                    23.3%
                                 | |
| 2002 | 13 | 
                                    
                                    21.7%
                                 | |
| 2003 | 10 | 
                                    
                                    16.7%
                                 | |
| 2004 | 6 | 
                                    
                                    10%
                                 | |
| Sysmiss | 1496 |